• Master intercom works with one door or sub-master intercom (sold separately) to enable audio communication with visitors or other rooms within the building.
• Initiates calls to and receives calls from a sub-master station for internal communication.
• Listening feature allows the master intercom operator to receive audio transmission from a door or sub-master intercom at any time.
• Adjustable audio volume.

The Aiphone LEM-1 Open Voice master intercom works with one Aiphone LE series door or sub-master intercom (sold separately) to enable audio communication with visitors at a door and with other rooms within the building. The master intercom can initiate communication with and receive calls from a door or sub-master intercom. Depressing the push-to-talk button on the master allows the user to talk to the door or sub-master intercom user, and releasing the button immediately transmits sound from the door or sub-master intercom to the master for 20 seconds. At any time, the master user can listen to audio transmissions from the door or sub-master intercom. The audio volume is adjustable, and sw the power button to off silences the master intercom's chime alerts. The housing is white plastic and s to a wall using the included bracket. The system is hardwired to be powered by a 6V power supply (sold separately). SpecificationsOverall dimensions6-5/16 x 5-3/16 x 2 inches/160 x 132 x 51 mm (H x W x D)*Communication output350 mWMaximum distance from door/sub to master650 ft. using a 22 AWG wire, 1,600 ft. using an 18 AWG wireCompatible wiresAiphone 822202 or 821802 (sold separately)Power requirementsAiphone SKK-620B 6V power supply (sold separately)*H is height, the vertical distance from the lowest to highest point; W is width, the horizontal distance from left to right; D is depth, the horizontal distance from front to back. Door intercom systems allow an occupant of a building to communicate remotely with a visitor through at least one door intercom and master intercom. Master intercoms with a door-access button remotely unlock the door for the visitor. Aiphone manufactures intercom systems for residential, business, and care structures. The company, founded in Japan in 1948, has its North American headquarters in Bellevue, WA. Aiphone meets International Organization for Standardization (ISO) standards 9001 and 14001. What's in the Box? ------------------ * Aiphone LEM-1 master intercom * ing bracket * ing hardware * Instructions