No bigger than a cellphone, this little box is effective to completely block GPS signals. Worried about being tracked? If you suspect there is a GPS tracker hidden in your own car, then get this GPS jammer and be free to go whereever you want without anyone knowing it.We have quite a range of spying devices. Trackers can be trouble. It was about time to offer you anti-spying and anti-surveillance device, i.e. a GPS tracker jammer.Do not fear being tracked upon. Get in your car, turn the engine on, turn the jammer on and you are free like the wind. Unnoticed. Untracked. In total control.Type of signals blocked:- GPS L1: 1500-1600MHz- GPS L2: 1200-1300MHzRadius of operation: 10 metersLi-ion 1200mAh batteryBattery life:3 hours max. of continuous use, more than 300 hours in standbyCE, FCC, RoHSDimensions: 97 x 47 x 18 mm