Range: 2G+3G+4G+2.4 WiFI+GPS+Beidou+Base Station Positioning Coverage:GPS Beidou: 8-12 meters Mobile phone signal: 3-5 meters (the specific coverage area depends on the strength of the base station signal) Strong performance, small size, easy to carry, wide coverage, can work continuously for 24 hours, double switch control, does not affect the mobile phone signal, switch functions at any time Colour:dark blue Material:Metal Package Contents: 1 x Signal Blocker 1 x Car charging 1 x USB Cable Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.