Single zone audio monitoring system Designed to interface with VCR/DVR’s Desk top base unit has a 3" speaker for monitoring live audio Built-in filtering enhances audio playback from 24 hour time-lapse recorders Low impedance electret condenser microphone can pick up normal sounds approximately 15’ away or within a 30’ diameter circle Applications include convenience stores, fastfood, police interview rooms, therapy rooms and casino soft count rooms