Today we would like to introduce our Signal Jammer DZ-101D-C. 1. TX-Frequency: (A)TX-Frequency: 900MHz (B)TX-Frequency: 1800MHz Available Systerm: GSM, CDMA, DCS, PCS and PHS 2. Total Output Power: 240w 3. valid jammer diameter: 150-350 meters depends on -75dBm 4. Power supply: AC110V or AC220V 5. Antenna: 1pcs 65 degrees directional panel antennas 6. worktime: It can work stably for long time Welcome to contact us for more details and thanks for you business opportunity Bill Hong 8613603042894 asiconbill(AT)hotmail.com dzxbill(AT)gmail.com skype:asiconbill