Cellphone Jammers, Mobile Phone Signal Booster, Prison Jammer manufacturer / supplier in China, offering Mini Size WiFi2.4/5.2/5.8g Signal Jammer for Secure Environments: School and Meeting Rooms, Bluetooth Hotspot and WiFi Signal Jammer with 5-15m Jamming Distance, Portable Drone Jammer – Waterproof/Dustproof Design with Smart Cooling Technology and so on.