OBD 12V/24V Car GPS Signal Interference Blo cker Shield Privacy Protection Positioning Anti Tracking Stalking for Auto Vehicles good

.Shield GPS signal band with a total transmitting power of 0.8W, effectively prevent your car from being tracked by GPS, and protect your whereabouts privacy. 2.Effectively shielding distance ranges from 1 to 15 meters, which can be adjusted according to customers' requirement. 3.Easy to use and low power to consume, no harmful to human body and environment. 4.Small size and lightweight to conveniently carry. 5.Applicable place:in the car,in the room,in meeting,At ATM,Locker Room Voltage: 12V-24V Frequency Range: 1560-1580MHz Operation Frequency Bandwidth: 20Hz Product Size: about 8.6 x 2 x 2.1cm/3.4 x 0.8 x 0.8in