Cellphone Jammers, Mobile Phone Signal Booster, Prison Jammer manufacturer / supplier in China, offering 2-5W Each Band Powerful 12 Antennas Portable Signal Jammer Jamming 2g 3G 4G 5g Wi-Fi GPS UHF VHF Handheld Signal Jammer J12PRO Form Sz Vodasafe, Enhanced 12 Antennas Phone/WiFi/Bluetooth Signal Jammer with Coverage Radius of 1-15 Meter for Multiple Occasions, High-Power 22W 12-Way Signal Jammer Effective for 2/3/4/5g, WiFi and Bluetooth and so on.