Sienoc 5 PCS BNC Male Plug to RCA Female Jack Adapter Connector 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. This works two way, converting a male RCA plug into a male BNC plug, or a female BNC jack into a female RCA jack.