Monitor/talkback amplifier and companion unit to DG Series Base Stations when two-way listen/talkback is required. Has a 3" built-in speaker for monitoring audio and jack for a hand-held dynamic microphone for talkback to the remote zones. "All Call" feature for addressing all zones simultaneously. Unit has monitor and talkback level controls, Input/Output jacks for recording and playback from a VCR or DVR, and headphone jack. Back panel contains ten audio inputs for accepting up to ten DG25III Base Stations. Rack mountable.