GSM Jammer Block Number When Calling

6 Bands Signal Jammer - 3G Cell Phone Jammer - Lojack Jammer - 315MHZ/433MHZ Jammer Specifications■Adjustable Desktop 6 Bands Signal Jammer - 3G Cell Phone Jammer - Lojack Jammer - 315MHZ/433MHZ Jammer■Isolating Signal Bandwidth:- CDMA/GSM (925MHz - 960MHz)- DCS/PHS (1805MHz - 1990MHz)- 315MHZ- 433MHZ- 3G (2110 - 2170MHz)- Lojack: 167-175MHz■Antenna: 6 x Omni-directional Antennas ■Shielding Radius Range: up to 40 Meters (depending on the mobile service provider's network condition and background signal strength) ■Power supply: 50 to 60Hz,Website:http://www.jammerwill.com, 100 to 240V AC■Total output Power: 15 watt■Color: Black■Suitable for: Police and Meeting Room, Security Services, Military Units,Prisons, Banks, Churches, Conference Rooms, Classrooms, Secret Services, News Conference Rooms, Libraries, Museums, Customs, Houses, Car.Use Notes: ■Be sure to connect all the antenna before the power supply is switch on. ■When you get the device in the first time,recharge the device only after the power is used out.To prolong the lifespan of the device, try to recharge it no less than 12 Hours. ■Any sealed mark on the machine teared are void, excluding from the repaired service. ■Don't put the jammer in the water and fire to avoid using in the bad, Condition of over-wet, over-hot, high voltage and high magnetism. ■Antenna shall be used vertical to the ground, working more efficiently.Package Contents■6 Bands Signal Jammer■AC Power Charger  ■Car charger ■6 x Antennas ■User ManualProduct Reviews:1.good product, good price. i bought 8pcs and sold out in one day, will back for more, hoping some discounts.2. Very good product,fast shipping and high quality.3. the resolution is really wonderful, cool.