Aiphone LEM-1DLS Access Sentry Set, 3-Piece, Includes LE-D, LEM-1DL, 1 PT-1210N

The LEM-1DLS Access Sentry system is an audio door answering and door release system for business use. The set includes a desk or wall mount master station, a surface mount door station, and an AC transformer to power the system. A call from the door station sounds a momentary electronic tone at the master station. To answer, simply press the "talk" button to speak to the person outside the door, and release to listen. The person at the door station speaks hands free. A door release mechanism can be activated by pressing the door release button (key symbol).