Portable GPS Jammer To Jammer GPS-GPRS Signal

To Jammer GPS Signal in anywhere with this portable gps jammer,built in battery to allow you jammer GPS signal in office,room,car and other place, with 20meter effective radius you can protect yourself do not be tracked by anyone else,GPS satellite can not located your position.
Portable GPS Jammer To Jammer GPS-GPRS Signal In Anywhere Specification:
Working Band: L1 system 1450 to 1600Mhz
Coverage : 0.5M-----20M
Power supply: 5V
Currency: 550mA
Build in battery inside: 3.7V
Charge time: 3 hours
Work temperature: -30
Relative humidity: 5
Accessories:
1xCar Charger
1xMains Charger (100-240V)
1xDetachable Antenna