Verifact D-V is a low impedance electret condenser microphone mounted to a 16 gauge stainless steel faceplate. It fits into a single gang electrical box for flush or surface mounting and is designed for areas of high vandalism.Main FeaturesMay be located up to 1000' from base stationPowered from Louroe Base Station Microphone preamp contains sensitivityswitch for lowering gain Fits into single gang electrical box (not included)