• Master intercom works with any combination of up to three door or sub-master intercoms (sold separately) to enable audio communication with visitors and other rooms within the building.
• Three buttons with LED indicators allow the master intercom to direct a call and communicate with the desired door or sub-master intercom.
• 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-3 Open Voice selective-call master intercom works with any combination of up to three Aiphone LE series door or sub-master intercoms (sold separately) to enable audio communication with a visitor at a door and with other rooms within the building. Three buttons with LED indicators allow the master intercom to direct a call and communicate with the desired door or sub-master intercom. Depressing the push-to-talk button on the master intercom 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 a 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. The system is hardwired to be powered by a 6V power supply (sold separately). SpecificationsOverall dimensions7-1/16 x 5-5/8 x 2-3/16 inches/180 x 143 x 55 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-3 master intercom * ing hardware * Instructions