CCTV Mic is used to connect audio input to DVRs having audio input jacks. It comes with a RCA jack/connector to connect easily the signal output from mic to DVR. This mic has very good noise cancellation and a frequency range between 100-20Khz. The mic captures voice effectively to distance from 5-20m. Make sure you are connecting the signal output (white wire) of the mic to Audio IN port of DVR for proper connection.
