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The Aiphone LEM-1DL single-door Access Sentry System master intercom works with any Aiphone LE or LS Series door intercom (sold separately) to enable audio communication with visitors at a door prior to granting access using the door-release button. The door-release button works with an electric strike (sold separately) to remotely unlock the entrance for the visitor. The master intercom emits an audible signal to indicate an incoming call from the door intercom. Pressing the push-to-talk button allows the master intercom operator to talk to the visitor, and releasing the button automatically transmits sound from the door intercom. The chime and audio volume is adjustable. The housing is white plastic and mounts to a desktop or wall using the included mounting hardware. Additional LEM-1DL master intercoms (sold separately) can be connected to the system using an Aiphone DAK-2S adapter (sold separately) to extend coverage into other rooms; each master requires its own AC transformer or DC power supply (sold separately).