20W Output Power Cell Phone Signal Jammer for Exam Halls , Up to 50m Long Distance

20W Output Power Cell Phone Signal Jammer for Exam Halls , Up to 50m Long Distance

Cell Phone Signal Jammer Description:

A mobile phone jammer is an instrument used to stop cellular phones from receiving signals from base stations. The jammer effectively disables cellular phones. It transmits on the same radio frequencies as the cell phone, disrupting the communication between the phone and the cell-phone base station in the tower. That's how the Signal Jammer working.

Now we recommend our GW-JB20 for you which can work excellently in jamming the signals at examination hall.

This is a desktop adjustable 20watt ouput power jammer, what is different from many other type of desktop adjustable output power jammers in the market is that it owns powerful jamming effect and ability. This is a 4 bands adjustable output power jammer so that it can cut off the 2G, 3G, 4G, WiFi Signals very easily, and since designed with high quality the jamming radius is up to 70 meters at most according to the signal strength.

The Signal Jammer GW-JB20 has 4 antennas supporting 4 frequencies of GSM, DCS, WCDMA, PCS or any other frequencies can be customized and it comes with good cooling system.

GREETWIN COMPANY is a special manufacturer of signal jammers and signal repeaters.
Our market research and development department has introduced new products to meet the ever-changing needs of customers since 2008.
To solve your information security issues, is our relentless pursuit.

We also have a lot of high quality products on this website and will be grateful if you can browse more products.

Need mobility? Please browse our portable mobile blocker section.
As always, if you have any questions we are happy to assist you.

Cell Phone Signal Jammer Features:

1. Good cooling system,

2. Jamming range up to 50m.

3. cost-effective choice,

4. Stable capability,

5. Output power 20w , make more efficient jamming.

6. Heat sink case makes the jammer work in a more stable and cool situation.

7. Four channels with different frequency range,

or customize other cellular standard in the world.

Such as Walkie Talkie,450MHz,GPRS,iDEN,GPS, Galileo,Compass,Glonass,UMTS,WiFi,AWS,LTE 4G.

8. Transmit noise signal to cut off all communication between cell phone and Base station.

The jammed cell phone will show “No Service” .

will not be able to receive or dial outgoing calls.

Cell Phone Signal Jammer Application:

Theatres, offices,Meeting Room, Oil and Gas Storage Facilities and fields, Hospitals,
Recording Studios, Banks, Contract Tendering Rooms, Churches, Conference
Rooms, Classrooms, Testing Facilities, Security Services, Military, Secret
Services, Libraries, Museums, Courts, Border Patrol and Drug Enforcement,

Customs, House, mosques, Libraries, Prisons, etc.

Cell Phone Signal Jammer Specification:

Only interfere downlink frequency of mobile system, can’t affect normal operation of Base Station.

GW-JB20 is a sophisticated high power desktop cellular phone jammer.

It can be used for all the worldwide network frequency system.

It is the best choice for Examination Hall, Conference rooms, and offices.

Shenzhen Greetwin Technology Co., Limited is one of the leading suppliers which specializes in designing and manufacturing RF Jamming Equipment and Wireless Coverage Products.

Wireless Coverage Products include 2G 3G 4G LTE 5G RF Repeater.

The RF Repeater solutions will bring smooth and clear calls, support all bandwidths and mobile standards including TETRA, iDEN, LTE700, GSM850, EGSM, GSM900, DCS1800, PCS1900, CDMA800, CDMA450, LTE 4G, CDMA2000, 3G(WCDMA), LTE2600 and TDD-LTE series.

Such as, Wide band Repeater, Band selective Repeater, Digital Repeater, High Power Outdoor Repeater, Fiber Optic Repeater, ICS Repeater, Consumer Signal Booster, Power Amplifier.

We are committed to providing the best solutions for mobile operators, offering OEM and ODM service. Products can be customized according to different operators in the world and the output power are available from 0.01W to 20W.

RF Jamming Equipment include Cell Phone Signal Jammer, RF Communication Jammer(20-6000MHz) and 20-200W Power amplifier.

GREETWIN is the foremost innovator in the field of RF jamming, offering a comprehensive range of jamming equipment and systems which have a proven record of reliability and performance in all types of applications and environmental conditions.

In countering the ever-growing threat of remotely controlled improvised explosive devices (RCIEDs), we has invested heavily in the development of a range of multi-band, very-high-power jamming systems for the protection of troop transportation, military and police checkpoints, large governmental establishments, bomb disposal squads and VIP convoys.

Such as, 5KM Drone jammer, UAV jammer, High power bomb jamming devices, Military IED jammers, Digital programable jammer, VIP Convoy Bomb Jammers (RCIED Jammers), Mobile Phone Signal Jammers, Prison Jammers, Portable Jammers, Handheld Jammers, to suit all types counter terrorism activities.

Our clients are government agencies, military, SWAT team, prison, school, bank, law enforcement and VVIPs. We also serve corporations and private individuals who must take responsibility for protecting assets, proprietary information, executives and family members.

GREETWIN products have been exported to more than 60 countries and regions around the world. Such as Southeast Asia, Africa, Europe, South America and the Middle East.

Let us hand in hand and create a glorious cause!