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Feature

Master intercom works with any combination of up to three door, sub-master, or 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 operator to direct a call and communicate with the desired door or sub-master intercom
Privacy button prevents other intercom users in the system from overhearing a conversation with another intercom
Listening feature allows the master intercom operator to receive audio transmission from a door or sub-master intercom at any time
Adjustable chime and audio volume