The ETS SM2-L powers an SM1 series microphone and routes its audio output to an RCA jack (or 3.5mm) for connection to equipment with a un-balanced line level input.
Additionally the SM2-L is for use with DVRs, I/P cameras, remote monitoring applications, and CCTV monitors with built in speakers. Ideal for use with any SM1-X microphone and I/P camera "microphone level" inputs.