ASK-4 #501 is a single zone audio monitoring system with two-way listen and talkback. Remote unit contains an omni-directional electret condenser, low impedance microphone and a 2.5" speaker, all within one housing. Desktop base unit produces live audio and playback.

Talkback from base unit to remote speaker/microphone is actuated by engaging the "push to talk" switch and speaking into the built-in microphone. Person at the remote speaker/microphone can listen and talk hands-free.

Input/output to DVR/VCR for recording and audio playback. TLM-W faceplate can be surface mounted to a plastic backbox (supplied) or flush mounted to a 3-gang electrical box.