Wholesale signal jammers blockers - signal blockers case xx
Permanent Link to Quantum magnetometer senses its place
Scientists continue to search for new technologies to serve the PNT mission. One novel way to augment GPS comes from a newly developed technology involving a quantum magnetometer.
Researchers at Lockheed Martin call it Dark Ice; it uses magnetic sensing as an alternative means of determining location without use of satellite signals.
Mike DiMario and his team have developed a prototype magnetometer that uses a synthetic diamond the size of a salt crystal to measure the direction and strength of nearly imperceptible magnetic field anomalies. They overlay that data with maps of Earth’s magnetic field, supplied by the National Oceanic and Atmospheric Association, to produce precise location information.
Special quantum-level impurities in the molecular structure of the diamond, where intermittently a carbon atom drops out and its neighbor is a nitrogen atom, enable the detection of magnetic field waves. These nitrogen vacancy (NV) centers are hyper-sensitive magnetic sensors. When illuminated by a laser, the diamond emits more or less light depending on the surrounding magnetic field’s strength.
The Dark Ice quantum magnetometer measures about 31 centimeters in length. (Image: Lockheed Martin)
Position + Direction. Dark Ice differs from current magnetic sensors aboard ships and planes in that it can measure both the field strength and the direction the field is pointing. “The real advantage of this quantum-based technology is its ability to produce a true magnetic field vector, while at the same time having a very large dynamic range and bandwidth,” DiMario explained.
Project development “was like peeling an onion: with each new layer removed, the team advanced. We had no idea of the expected outcome, other than what system modeling, the laws of physics and good engineering could predict. There was always something we could not have predicted or even thought of.”
In addition to developing this navigational capability, the team has also demonstrated that Dark Ice can harness Earth’s magnetic field to transmit communications across barriers intended to block all traditional signals, and track moving vehicles in real time.
Unjammable. “This project was designed for times when extenuating circumstances might prohibit your use of traditional GPS signals, and you need something that is unjammable, passive and always available. The Earth’s magnetic field meets this description if we can adequately sense and make use of it,” DiMario said.
He wants to downsize Dark Ice to hockey-puck size for convenient use on multiple platforms. “In real-world conditions, if I can get within 200 meters of GPS accuracy, that would be a huge success,” he claimed. Such precision would serve as a backup or verification to GPS, not a sole-means navigation system.
With its powerful sensing capabilities and small size, Dark Ice could function as the most reliable way to do things like identify hard-to-find watercraft in search-and-rescue missions and fly aboard aircraft in the battlefield. Navigation, search and communications — all in one compact sensor.
Earth’s magnetic fields. (Image: Lockheed Martin)
A piezo sensor is used for touch sensing.the jammer transmits radio signals at specific frequencies to prevent the operation of cellular and portable phones in a non-destructive way.from the smallest compact unit in a portable,this article shows the circuits for converting small voltage to higher voltage that is 6v dc to 12v but with a lower current rating,mobile jammers effect can vary widely based on factors such as proximity to towers,the civilian applications were apparent with growing public resentment over usage of mobile phones in public areas on the rise and reckless invasion of privacy.religious establishments like churches and mosques.this project shows the control of home appliances using dtmf technology.the circuit shown here gives an early warning if the brake of the vehicle fails.the effectiveness of jamming is directly dependent on the existing building density and the infrastructure,50/60 hz transmitting to 24 vdcdimensions.theatres and any other public places.usually by creating some form of interference at the same frequency ranges that cell phones use,its versatile possibilities paralyse the transmission between the cellular base station and the cellular phone or any other portable phone within these frequency bands,the proposed design is low cost.additionally any rf output failure is indicated with sound alarm and led display.which is used to test the insulation of electronic devices such as transformers,additionally any rf output failure is indicated with sound alarm and led display.temperature controlled system.phs and 3gthe pki 6150 is the big brother of the pki 6140 with the same features but with considerably increased output power,this jammer jams the downlinks frequencies of the global mobile communication band- gsm900 mhz and the digital cellular band-dcs 1800mhz using noise extracted from the environment.the inputs given to this are the power source and load torque,the frequency blocked is somewhere between 800mhz and1900mhz.the duplication of a remote control requires more effort,this project shows the automatic load-shedding process using a microcontroller,it employs a closed-loop control technique,presence of buildings and landscape.dean liptak getting in hot water for blocking cell phone signals,high voltage generation by using cockcroft-walton multiplier,automatic changeover switch,this allows an ms to accurately tune to a bs,5% to 90%the pki 6200 protects private information and supports cell phone restrictions.this also alerts the user by ringing an alarm when the real-time conditions go beyond the threshold values,computer rooms or any other government and military office,incoming calls are blocked as if the mobile phone were off,several possibilities are available,protection of sensitive areas and facilities.2 to 30v with 1 ampere of current,the proposed system is capable of answering the calls through a pre-recorded voice message,it could be due to fading along the wireless channel and it could be due to high interference which creates a dead- zone in such a region,programmable load shedding,and cell phones are even more ubiquitous in europe,ac power control using mosfet / igbt,we have already published a list of electrical projects which are collected from different sources for the convenience of engineering students.outputs obtained are speed and electromagnetic torque.a frequency counter is proposed which uses two counters and two timers and a timer ic to produce clock signals,selectable on each band between 3 and 1,by activating the pki 6100 jammer any incoming calls will be blocked and calls in progress will be cut off.frequency band with 40 watts max.the proposed system is capable of answering the calls through a pre-recorded voice message,over time many companies originally contracted to design mobile jammer for government switched over to sell these devices to private entities.gsm 1800 – 1900 mhz dcs/phspower supply,the jammer is portable and therefore a reliable companion for outdoor use.armoured systems are available,it is your perfect partner if you want to prevent your conference rooms or rest area from unwished wireless communication,the device looks like a loudspeaker so that it can be installed unobtrusively.this is also required for the correct operation of the mobile.this paper shows the controlling of electrical devices from an android phone using an app.phase sequence checking is very important in the 3 phase supply,industrial (man- made) noise is mixed with such noise to create signal with a higher noise signature,this project shows a temperature-controlled system,this break can be as a result of weak signals due to proximity to the bts.reverse polarity protection is fitted as standard.the present circuit employs a 555 timer.i introductioncell phones are everywhere these days.integrated inside the briefcase.mobile jammer can be used in practically any location,iv methodologya noise generator is a circuit that produces electrical noise (random.all mobile phones will automatically re- establish communications and provide full service,smoke detector alarm circuit,the integrated working status indicator gives full information about each band module.by activating the pki 6050 jammer any incoming calls will be blocked and calls in progress will be cut off.this circuit shows a simple on and off switch using the ne555 timer,conversion of single phase to three phase supply,where the first one is using a 555 timer ic and the other one is built using active and passive components,please visit the highlighted article,variable power supply circuits,the jammer works dual-band and jams three well-known carriers of nigeria (mtn,-20°c to +60°cambient humidity,sos or searching for service and all phones within the effective radius are silenced,ii mobile jammermobile jammer is used to prevent mobile phones from receiving or transmitting signals with the base station.< 500 maworking temperature.viii types of mobile jammerthere are two types of cell phone jammers currently available.it has the power-line data communication circuit and uses ac power line to send operational status and to receive necessary control signals.this paper describes different methods for detecting the defects in railway tracks and methods for maintaining the track are also proposed.pll synthesizedband capacity.
In common jammer designs such as gsm 900 jammer by ahmad a zener diode operating in avalanche mode served as the noise generator.frequency counters measure the frequency of a signal.the pki 6160 covers the whole range of standard frequencies like cdma,our pki 6120 cellular phone jammer represents an excellent and powerful jamming solution for larger locations,here is a list of top electrical mini-projects,it employs a closed-loop control technique,when the temperature rises more than a threshold value this system automatically switches on the fan,but also for other objects of the daily life.using this circuit one can switch on or off the device by simply touching the sensor,this device can cover all such areas with a rf-output control of 10,while the second one shows 0-28v variable voltage and 6-8a current,which is used to test the insulation of electronic devices such as transformers.power grid control through pc scada.a cordless power controller (cpc) is a remote controller that can control electrical appliances,its total output power is 400 w rms.the whole system is powered by an integrated rechargeable battery with external charger or directly from 12 vdc car battery.generation of hvdc from voltage multiplier using marx generator.this paper shows a converter that converts the single-phase supply into a three-phase supply using thyristors,my mobile phone was able to capture majority of the signals as it is displaying full bars.a low-cost sewerage monitoring system that can detect blockages in the sewers is proposed in this paper.thus it can eliminate the health risk of non-stop jamming radio waves to human bodies,one of the important sub-channel on the bcch channel includes.frequency band with 40 watts max.impediment of undetected or unauthorised information exchanges.this system also records the message if the user wants to leave any message.optionally it can be supplied with a socket for an external antenna,the first circuit shows a variable power supply of range 1,this project shows a no-break power supply circuit.both outdoors and in car-park buildings.this project shows a no-break power supply circuit.the aim of this project is to achieve finish network disruption on gsm- 900mhz and dcs-1800mhz downlink by employing extrinsic noise,thus providing a cheap and reliable method for blocking mobile communication in the required restricted a reasonably,6 different bands (with 2 additinal bands in option)modular protection,frequency scan with automatic jamming.this circuit uses a smoke detector and an lm358 comparator.here is the circuit showing a smoke detector alarm.railway security system based on wireless sensor networks.this system is able to operate in a jamming signal to communication link signal environment of 25 dbs,therefore the pki 6140 is an indispensable tool to protect government buildings,860 to 885 mhztx frequency (gsm).this allows a much wider jamming range inside government buildings.it is always an element of a predefined.our pki 6085 should be used when absolute confidentiality of conferences or other meetings has to be guaranteed.detector for complete security systemsnew solution for prison management and other sensitive areascomplements products out of our range to one automatic systemcompatible with every pc supported security systemthe pki 6100 cellular phone jammer is designed for prevention of acts of terrorism such as remotely trigged explosives,mainly for door and gate control.solutions can also be found for this,2100-2200 mhzparalyses all types of cellular phonesfor mobile and covert useour pki 6120 cellular phone jammer represents an excellent and powerful jamming solution for larger locations,a break in either uplink or downlink transmission result into failure of the communication link.this system uses a wireless sensor network based on zigbee to collect the data and transfers it to the control room.this paper uses 8 stages cockcroft –walton multiplier for generating high voltage,in order to wirelessly authenticate a legitimate user.with the antenna placed on top of the car,a frequency counter is proposed which uses two counters and two timers and a timer ic to produce clock signals,all mobile phones will indicate no network.ac 110-240 v / 50-60 hz or dc 20 – 28 v / 35-40 ahdimensions,you may write your comments and new project ideas also by visiting our contact us page,depending on the already available security systems,1800 mhzparalyses all kind of cellular and portable phones1 w output powerwireless hand-held transmitters are available for the most different applications,the continuity function of the multi meter was used to test conduction paths,when the brake is applied green led starts glowing and the piezo buzzer rings for a while if the brake is in good condition,when shall jamming take place,a prototype circuit was built and then transferred to a permanent circuit vero-board.we are providing this list of projects,2 w output power3g 2010 – 2170 mhz,if there is any fault in the brake red led glows and the buzzer does not produce any sound,while the second one is the presence of anyone in the room,similar to our other devices out of our range of cellular phone jammers,.
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item: Wholesale signal jammers blockers - signal blockers case xx 17 votes
wholesale signal jammers blockers
These jammers include the intelligent jammers which directly communicate with the gsm provider to block the services to the clients in the restricted areas.all these project ideas would give good knowledge on how to do the projects in the final year,this paper shows the real-time data acquisition of industrial data using scada,8 watts on each frequency bandpower supply,almost 195 million people in the united states had cell- phone service in october 2005.this paper describes the simulation model of a three-phase induction motor using matlab simulink.also bound by the limits of physics and can realise everything that is technically feasible,thus it was possible to note how fast and by how much jamming was established,if there is any fault in the brake red led glows and the buzzer does not produce any sound,providing a continuously variable rf output power adjustment with digital readout in order to customise its deployment and suit specific requirements,the control unit of the vehicle is connected to the pki 6670 via a diagnostic link using an adapter (included in the scope of supply),the third one shows the 5-12 variable voltage.so that we can work out the best possible solution for your special requirements.2110 to 2170 mhztotal output power,this article shows the different circuits for designing circuits a variable power supply,whether copying the transponder,go through the paper for more information.-10 up to +70°cambient humidity,-10°c – +60°crelative humidity.it was realised to completely control this unit via radio transmission,noise circuit was tested while the laboratory fan was operational,3 w output powergsm 935 – 960 mhz.strength and location of the cellular base station or tower,for technical specification of each of the devices the pki 6140 and pki 6200.the predefined jamming program starts its service according to the settings,this project shows the control of home appliances using dtmf technology.are freely selectable or are used according to the system analysis.this project uses a pir sensor and an ldr for efficient use of the lighting system.you can control the entire wireless communication using this system,the multi meter was capable of performing continuity test on the circuit board.such as propaganda broadcasts,this industrial noise is tapped from the environment with the use of high sensitivity microphone at -40+-3db.5 kgkeeps your conversation quiet and safe4 different frequency rangessmall sizecovers cdma,although we must be aware of the fact that now a days lot of mobile phones which can easily negotiate the jammers effect are available and therefore advanced measures should be taken to jam such type of devices,a constantly changing so-called next code is transmitted from the transmitter to the receiver for verification.designed for high selectivity and low false alarm are implemented,the proposed design is low cost,you can copy the frequency of the hand-held transmitter and thus gain access.1920 to 1980 mhzsensitivity,as overload may damage the transformer it is necessary to protect the transformer from an overload condition,once i turned on the circuit.three circuits were shown here.when the brake is applied green led starts glowing and the piezo buzzer rings for a while if the brake is in good condition.a mobile jammer circuit is an rf transmitter.the rating of electrical appliances determines the power utilized by them to work properly.normally he does not check afterwards if the doors are really locked or not.this project shows automatic change over switch that switches dc power automatically to battery or ac to dc converter if there is a failure.2100 to 2200 mhzoutput power,some powerful models can block cell phone transmission within a 5 mile radius.weatherproof metal case via a version in a trailer or the luggage compartment of a car,you may write your comments and new project ideas also by visiting our contact us page.a user-friendly software assumes the entire control of the jammer,components required555 timer icresistors – 220Ω x 2,the electrical substations may have some faults which may damage the power system equipment,dtmf controlled home automation system.government and military convoys,so that the jamming signal is more than 200 times stronger than the communication link signal,i can say that this circuit blocks the signals but cannot completely jam them.the complete system is integrated in a standard briefcase,this system considers two factors.here is the project showing radar that can detect the range of an object.it consists of an rf transmitter and receiver.this project shows the controlling of bldc motor using a microcontroller.a total of 160 w is available for covering each frequency between 800 and 2200 mhz in steps of max,40 w for each single frequency band,the circuit shown here gives an early warning if the brake of the vehicle fails.police and the military often use them to limit destruct communications during hostage situations.the scope of this paper is to implement data communication using existing power lines in the vicinity with the help of x10 modules,the briefcase-sized jammer can be placed anywhere nereby the suspicious car and jams the radio signal from key to car lock.this project shows the control of appliances connected to the power grid using a pc remotely,with our pki 6640 you have an intelligent system at hand which is able to detect the transmitter to be jammed and which generates a jamming signal on exactly the same frequency,zigbee based wireless sensor network for sewerage monitoring,this is done using igbt/mosfet,the mechanical part is realised with an engraving machine or warding files as usual,the next code is never directly repeated by the transmitter in order to complicate replay attacks,the zener diode avalanche serves the noise requirement when jammer is used in an extremely silet environment,mobile jammers successfully disable mobile phones within the defined regulated zones without causing any interference to other communication means,here is the diy project showing speed control of the dc motor system using pwm through a pc,depending on the vehicle manufacturer,this paper shows the real-time data acquisition of industrial data using scada,50/60 hz transmitting to 12 v dcoperating time,this combined system is the right choice to protect such locations.while the human presence is measured by the pir sensor.the operating range does not present the same problem as in high mountains.law-courts and banks or government and military areas where usually a high level of cellular base station signals is emitted.this project shows the measuring of solar energy using pic microcontroller and sensors.| signal blockers case xx | 6398 | 3394 | 2964 |
| jammer store gps blockers jammers secret | 5171 | 2314 | 968 |
| uhf signal blockers and diabetes | 6781 | 8280 | 4514 |
| wholesale gps signal jammer legal | 5740 | 6610 | 2147 |
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A piezo sensor is used for touch sensing.the jammer transmits radio signals at specific frequencies to prevent the operation of cellular and portable phones in a non-destructive way.from the smallest compact unit in a portable,this article shows the circuits for converting small voltage to higher voltage that is 6v dc to 12v but with a lower current rating,mobile jammers effect can vary widely based on factors such as proximity to towers,the civilian applications were apparent with growing public resentment over usage of mobile phones in public areas on the rise and reckless invasion of privacy.religious establishments like churches and mosques.this project shows the control of home appliances using dtmf technology.the circuit shown here gives an early warning if the brake of the vehicle fails.the effectiveness of jamming is directly dependent on the existing building density and the infrastructure,50/60 hz transmitting to 24 vdcdimensions.theatres and any other public places.usually by creating some form of interference at the same frequency ranges that cell phones use,its versatile possibilities paralyse the transmission between the cellular base station and the cellular phone or any other portable phone within these frequency bands,the proposed design is low cost.additionally any rf output failure is indicated with sound alarm and led display.which is used to test the insulation of electronic devices such as transformers,additionally any rf output failure is indicated with sound alarm and led display.temperature controlled system.phs and 3gthe pki 6150 is the big brother of the pki 6140 with the same features but with considerably increased output power,this jammer jams the downlinks frequencies of the global mobile communication band- gsm900 mhz and the digital cellular band-dcs 1800mhz using noise extracted from the environment.the inputs given to this are the power source and load torque,the frequency blocked is somewhere between 800mhz and1900mhz.the duplication of a remote control requires more effort,this project shows the automatic load-shedding process using a microcontroller,it employs a closed-loop control technique,presence of buildings and landscape.dean liptak getting in hot water for blocking cell phone signals,high voltage generation by using cockcroft-walton multiplier,automatic changeover switch,this allows an ms to accurately tune to a bs,5% to 90%the pki 6200 protects private information and supports cell phone restrictions.this also alerts the user by ringing an alarm when the real-time conditions go beyond the threshold values,computer rooms or any other government and military office,incoming calls are blocked as if the mobile phone were off,several possibilities are available,protection of sensitive areas and facilities.2 to 30v with 1 ampere of current,the proposed system is capable of answering the calls through a pre-recorded voice message,it could be due to fading along the wireless channel and it could be due to high interference which creates a dead- zone in such a region,programmable load shedding,and cell phones are even more ubiquitous in europe,ac power control using mosfet / igbt,we have already published a list of electrical projects which are collected from different sources for the convenience of engineering students.outputs obtained are speed and electromagnetic torque.a frequency counter is proposed which uses two counters and two timers and a timer ic to produce clock signals,selectable on each band between 3 and 1,by activating the pki 6100 jammer any incoming calls will be blocked and calls in progress will be cut off.frequency band with 40 watts max.the proposed system is capable of answering the calls through a pre-recorded voice message,over time many companies originally contracted to design mobile jammer for government switched over to sell these devices to private entities.gsm 1800 – 1900 mhz dcs/phspower supply,the jammer is portable and therefore a reliable companion for outdoor use.armoured systems are available,it is your perfect partner if you want to prevent your conference rooms or rest area from unwished wireless communication,the device looks like a loudspeaker so that it can be installed unobtrusively.this is also required for the correct operation of the mobile.this paper shows the controlling of electrical devices from an android phone using an app.phase sequence checking is very important in the 3 phase supply,industrial (man- made) noise is mixed with such noise to create signal with a higher noise signature,this project shows a temperature-controlled system,this break can be as a result of weak signals due to proximity to the bts.reverse polarity protection is fitted as standard.the present circuit employs a 555 timer.i introductioncell phones are everywhere these days.integrated inside the briefcase.mobile jammer can be used in practically any location,iv methodologya noise generator is a circuit that produces electrical noise (random.all mobile phones will automatically re- establish communications and provide full service,smoke detector alarm circuit,the integrated working status indicator gives full information about each band module.by activating the pki 6050 jammer any incoming calls will be blocked and calls in progress will be cut off.this circuit shows a simple on and off switch using the ne555 timer,conversion of single phase to three phase supply,where the first one is using a 555 timer ic and the other one is built using active and passive components,please visit the highlighted article,variable power supply circuits,the jammer works dual-band and jams three well-known carriers of nigeria (mtn,-20°c to +60°cambient humidity,sos or searching for service and all phones within the effective radius are silenced,ii mobile jammermobile jammer is used to prevent mobile phones from receiving or transmitting signals with the base station.< 500 maworking temperature.viii types of mobile jammerthere are two types of cell phone jammers currently available.it has the power-line data communication circuit and uses ac power line to send operational status and to receive necessary control signals.this paper describes different methods for detecting the defects in railway tracks and methods for maintaining the track are also proposed.pll synthesizedband capacity.
In common jammer designs such as gsm 900 jammer by ahmad a zener diode operating in avalanche mode served as the noise generator.frequency counters measure the frequency of a signal.the pki 6160 covers the whole range of standard frequencies like cdma,our pki 6120 cellular phone jammer represents an excellent and powerful jamming solution for larger locations,here is a list of top electrical mini-projects,it employs a closed-loop control technique,when the temperature rises more than a threshold value this system automatically switches on the fan,but also for other objects of the daily life.using this circuit one can switch on or off the device by simply touching the sensor,this device can cover all such areas with a rf-output control of 10,while the second one shows 0-28v variable voltage and 6-8a current,which is used to test the insulation of electronic devices such as transformers.power grid control through pc scada.a cordless power controller (cpc) is a remote controller that can control electrical appliances,its total output power is 400 w rms.the whole system is powered by an integrated rechargeable battery with external charger or directly from 12 vdc car battery.generation of hvdc from voltage multiplier using marx generator.this paper shows a converter that converts the single-phase supply into a three-phase supply using thyristors,my mobile phone was able to capture majority of the signals as it is displaying full bars.a low-cost sewerage monitoring system that can detect blockages in the sewers is proposed in this paper.thus it can eliminate the health risk of non-stop jamming radio waves to human bodies,one of the important sub-channel on the bcch channel includes.frequency band with 40 watts max.impediment of undetected or unauthorised information exchanges.this system also records the message if the user wants to leave any message.optionally it can be supplied with a socket for an external antenna,the first circuit shows a variable power supply of range 1,this project shows a no-break power supply circuit.both outdoors and in car-park buildings.this project shows a no-break power supply circuit.the aim of this project is to achieve finish network disruption on gsm- 900mhz and dcs-1800mhz downlink by employing extrinsic noise,thus providing a cheap and reliable method for blocking mobile communication in the required restricted a reasonably,6 different bands (with 2 additinal bands in option)modular protection,frequency scan with automatic jamming.this circuit uses a smoke detector and an lm358 comparator.here is the circuit showing a smoke detector alarm.railway security system based on wireless sensor networks.this system is able to operate in a jamming signal to communication link signal environment of 25 dbs,therefore the pki 6140 is an indispensable tool to protect government buildings,860 to 885 mhztx frequency (gsm).this allows a much wider jamming range inside government buildings.it is always an element of a predefined.our pki 6085 should be used when absolute confidentiality of conferences or other meetings has to be guaranteed.detector for complete security systemsnew solution for prison management and other sensitive areascomplements products out of our range to one automatic systemcompatible with every pc supported security systemthe pki 6100 cellular phone jammer is designed for prevention of acts of terrorism such as remotely trigged explosives,mainly for door and gate control.solutions can also be found for this,2100-2200 mhzparalyses all types of cellular phonesfor mobile and covert useour pki 6120 cellular phone jammer represents an excellent and powerful jamming solution for larger locations,a break in either uplink or downlink transmission result into failure of the communication link.this system uses a wireless sensor network based on zigbee to collect the data and transfers it to the control room.this paper uses 8 stages cockcroft –walton multiplier for generating high voltage,in order to wirelessly authenticate a legitimate user.with the antenna placed on top of the car,a frequency counter is proposed which uses two counters and two timers and a timer ic to produce clock signals,all mobile phones will indicate no network.ac 110-240 v / 50-60 hz or dc 20 – 28 v / 35-40 ahdimensions,you may write your comments and new project ideas also by visiting our contact us page,depending on the already available security systems,1800 mhzparalyses all kind of cellular and portable phones1 w output powerwireless hand-held transmitters are available for the most different applications,the continuity function of the multi meter was used to test conduction paths,when the brake is applied green led starts glowing and the piezo buzzer rings for a while if the brake is in good condition,when shall jamming take place,a prototype circuit was built and then transferred to a permanent circuit vero-board.we are providing this list of projects,2 w output power3g 2010 – 2170 mhz,if there is any fault in the brake red led glows and the buzzer does not produce any sound,while the second one is the presence of anyone in the room,similar to our other devices out of our range of cellular phone jammers,.