Connects BNC cameras to RJ11 line-fed cable plus 12V DC jackplug. Converts old 12V BNC cameras to line-fed, connects DC 12V plug on cable to camera, connects BNC(M) on camera to BNC(F) on cable, connects DC 12V plug on cable to camera, connects RJ11 type cable to socket. Cable runs to DVR. Use RJBNC/S1 to connect cable to DVR. Specifications: Compatible with all Direct Connect CCTV products and most other systems using adaptors available.