This is a GPS and GSM jammer to be used in a vehicle only from the 12v vehicle power supply. This unit will stop all vehicle tracking systems from obtaining vehicle position from satellites (GPS) and also then stop the subsequent messaging of vehicle position back to the tracking base (GSM).
Input Power (car battery) DC 12 volt  supply cigajack
Shielding frequency 

800~964 MHz
890~964 MHz
1.700~2.000 GHz
2.100~2.200Ghz
1.200/2.400Ghz
1.500Ghz Nextel/TDMA/NMTP/AMPS /CDMA800/Etacs/GSM900/
GSM1800/DCS/W-CDMA/PCS1900
GPS(L1) & GLONASS

Shielding(block) range
antenna output power within 1~45m radius (Can adjust)
Total   12W ( each antenna 4 watt ) Dependant upon environmental conditions
Working time   Long time working