Aiphone C-ML/A ChimeCom Master Intercom with Door Release Button

• Master intercom works with a door intercom (sold separately) to enable audio communication with visitors prior to authorizing access.
• Door release button controls an electric strike (sold separately) to remotely unlock the entrance for a visitor.
• Listening feature allows the master intercom operator to receive audio transmission from the door intercom at any time.
• Adjustable audio volume.
• Can be battery powered to facilitate installation where power outlets are not accessible.

The Aiphone C-123ML/A ChimeCom single-door master intercom works with an Aiphone C-D door intercom (sold separately) to enable audio communication with visitors prior to authorizing access to the building using the door release button. The master intercom has both a push-to-talk button and a pull cord that can be used to initiate audio transmission to the door intercom. Once the cord or button is released, sound from the door intercom is transmitted immediately to the master intercom, automatically shutting off after 20 seconds. The door-release button works with an electric strike (sold separately) to remotely unlock the entrance for the visitor. At any time, the push-to-talk button can be pressed or the chain pulled to listen through the door intercom. Housing is white plastic, and the audio volume is adjustable. The system is hardwired to be powered by a 6V power supply (sold separately) but can be powered by four C batteries (sold separately) to facilitate installation where power outlets are not accessible. SpecificationsOverall dimensions4-3/4 x 3-7/16 x 1-1/8 inches/120 x 88 x 29 mm (H x W x D)*Door release contact ratingNormally open dry contact 50V at 1AMaximum door distance from intercom245 ft. using a 22 AWG wire, 490 ft. using an 18 AWG wire (sold separately)Compatible wires (door to master intercom)Aiphone 822202 or 821802 (sold separately)Power requirementsFour C batteries (sold separately) or Aiphone 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? ------------------ * Master intercom * Dual master adapter kit * Sponges * ing hardware * Instructions