ASK-4 #101-E is a single zone audio monitoring system, designed for audio monitoring and interfacing with a DVR or VCR. The desk top base unit has a 3" speaker for monitoring live audio as well as playback. Contains mute switch to mute both live and playback audio. The low impedance electret condenser microphone is designed for ceiling mount and can pick up normal sounds approximately 15' away or within a 30' diameter circle. Distance between microphone and base station can be up to 1,000 ft.