BIG POWER GPS JAMMER, 120 M Instruction: Just plug this deviceand power ON, you will be protect from GPS tracker and All GPS system solution, to keep your piracy far away for the follower hacker. GPS jammer for all GPS tracker, GPS system, and other commercial GPS Only GPS frequency can be jam, GSM mobile phone will work normally Only plug in to car socket power, power switch to ON for easy operate. Small dimension, Hi power solution. Big power jamming solution, coverage area up to 120M Fuse protection circuit.