We are beijing briar technology company based in Beijing , China. We are member of Tradekey.com since January, 2012. Our business is related to Consumer Electronics industry and we specifically deal in video distributor ,cctv camera,anti-jammer,rs485,video otpical multiplexer,surveillance system,cctv DVR,video optical.. Please find our product details below: SD-485T485, fiber optical video converter 1.video converter for CCTV 2.0~1.5 Mbps automatically adaptive 3.24 VDC 1W DC power supply 4.good quality video converter anti-jamming 1.video antijam ability 2.built-in lightning protection 3.long transmission distance 4.automatic video antijam 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.