Cellphone Jammers, Mobile Phone Signal Booster, Prison Jammer manufacturer / supplier in China, offering New 12 Antennas High Power Jammer Cell Phone Signal Jamming Total Power 75 Watts, 16-Channel Signal Jammer with Display Screen in Black Shielded Casing Blocking VHF/UHF/GPS, 2g 3G 4G 5.8g 2.4G Portable Cell Phone Signal Jammer with 15 M Jamming Range Handheld Cell Phone Jammer and so on.