Jammer, Cell Phone Jammer, Prison Jammer manufacturer / supplier in China, offering High Power Jammer 30W 3 Bands Portable Signal Jammer Blocks 315MHz, 433/434MHz, 868MHz RF Signal, High Power Portable 12 Antennas Jammer with High Gain 2.5dBi Antennas, High Power Portable 12 Antennas Wireless Jammer and so on.