Features: 1. GPS signal frequency band location protection, with a transmit power of 0.8W, can effectively prevent your car from being tracked by GPS and your whereabouts privacy.2. The effective protection distance is 1-15 , which can be adjusted according to customer requirements.3. Easy to use, low power consumption, harmless to human body and environment.4. Small size, light weight and easy to carry.5. Applicable : in the car, in the room, in the meeting, on the ATM machine, in the locker room, on the motorcycleSpecification:Input voltage: DC 12-24VPower: 0.8WBlocking range: about 1-15 Working frequency: 1560-1580MHZTransmission frequency: Less than 2WCharging type: car lighter (12v-36v)Working temperature: -30--60Relative Humidity: 5 to 95%Product Dimensions: . 8.6 x 2 x 2.1cm/3.4 x 0.8 x 0.8 inches Antenna Length: . 6.8 cm / 2.7 inchesUsage:1. Remove the GPS unit and install the antenna.2. Plug the device into the car lighter socket.3. After the power is turned on, the indicator light is always on to indicate normal operation.4. Remove the car charger directly after use.Material: ABScolour: blackPackage Contents:1 x car signal hider1 x antennasOnly the above package content, other are not included.Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.