Jammer, Cell Phone Jammer, Prison Jammer manufacturer / supplier in China, offering 30W Portable Signal Jammer Blocks 315MHz, 433/434MHz, 868MHz RF Signal, 210W High Output Power 8 Bands Signal Jammer with Sheilding Range up to 150 Meters, High Power 12W 12 Antennas Jammer Cellphone Blocker and so on.