The easiest way to block the mobile phone signals of the 3G is using a 3G mobile phone jammer and cut off their signals. And this is also the same if you want to cut off the WiFi signal. And ready for you here is this 4 Band 2W Handheld WiFi 3G Mobile Phone Jammer, a handheld WiFi 3G jammer with just the above function.
Just as its name, this jammer is portable as owning dimensions of only 104x53x33mm (Not included antenna) and light weight, which is easy to held at hand or even be put into your pocket. Apart of blocking the signals of the 3G and WiFi, it can also cut off the signals of CDMA, GSM, and DCS as well. And with 2W output power the jamming distance is up to 20 meters depending on the signal strength. For the car users, a useful aspect is that this handheld WiFi 3G jammer owns the car charger, with which enable the device to be used in the car directly.
To any places where the mobile phones and WiFi are prohibited to be used, this device can be applied. But there is one point you need to pay attention is that this handheld WiFi 3G jammer can only block the WiFi 2.4G and can't block the 5.8G.
Isolating Signal Bandwidth:
-WiFi 2.4G: (2400MHz-2500MHz)
Total output power: 2W
Jamming range: Up to 20m, the jamming radius still depends on the strength signal in given area
External Omni-directional antennas all the TX frequency covered down link only
Power supply: 50 to 60Hz, 100 to 240V AC
With AC adapter (AC100-240V-DC12V) ,2000mA/ H battery
Continue using time: Around 90 minutes
Dimension: 104x53x33mm (Not included antenna)
WiFi Cellphone Signal Jammer