Surveillance kits with RCA audio input

RCA audio input

— a connector for transmitting an analogue audio signal to the recorder — for example, from a microphone or an analogue camera that has the ability to capture sound. The need for separate audio inputs is due to the fact that the standard BNC connector (see the relevant paragraph) does not support sound. However, keep in mind that not all registrars allow you to "voice" each video channel — there may be fewer RCA inputs than BNC.