To prevent GPS satellite positioning tracking Block GPS satellite signal, protect your whereabouts privacy and confidential in formation Block all the GPS satellite signal Not affect mobile phone and other electronic equipment’s working Car 12VDC fuse line protection Small size, high power, light weight, great coverage, easy to carry The most radiant power (far from 1 meter, dipole antenna test): below -10dBm Working frequency: 1500-1600MHz Power adjustment range: 33dBm 6dBm/30KHz (min) Effective jamming coverage (radius):2--15m Dimension: 75*20*20 mm Charging Specifications: Cigarette Lighter (12v) Storage temperature:-50~+60 C Working temperature: -30~60 C Relative humidity:5~95%