Jammer, Cell Phone Jammer, Prison Jammer manufacturer / supplier in China, offering High Quality 20 Watt 6 Antennas Wireless 2g 3G 4G (LTE+Wimax) Frequency Jammer, High Power Desktop Cell Phone Signal Jammer Signal Blocker Cover Range up to 150m, Portable High Power 8 Antennas Mobile Phone Signal Jammer Blocks 2g 3G 4G 5g Signals and so on.