This works two way converting a male RCA plug into a male BNC plug or a female BNC jack into a female RCA jack. If your video signal is from a BNC plug such as security camera but your monitor or TV input is RCA or you want to convert a RCA plug into a BNC signal this one really helps you. Connect a BNC cable to a RCA video input. Use BNC cable connect camera to TV VCR or DVR. Package 10x BNC male to RCA female