We are Shenzhen Huidetong Technology Co., Ltd. based in Shenzhen , China.Our business is related to Telecommunications industry and we specifically deal in signal jammer, filing cabinet. Please find our product details below: Prison Jamming System Detailed Product Description 1. 2011 New Designed Prison Jamming Model 2. 4 working bands for option 3. Strong Output power: 240W 4. Rain proof Sell Military Portable Cell Phone signal Jammer Detailed Product Description 1. Military Portable Cell Phone Jamming 2. Max output power up to 400W 3. 4 working bands 4. Jamming range about up to 500m Sell portable cellphone signal jammer Detailed Product Description * Portable Mobile Phone Signal Jamm * Total Output Power: 2.7W * Jams simultaneously up to 3 selected frequency bands Thank you for taking the time to go through our business profile. If there are any question, inquiry or comments, please feel free to contact us.