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The IE-8HD Audio Sub Master Station from Aiphone is used with a maximum of two IE series door stations, and a maximum of five IE-8HD can be connected in a system. An IE-8MD Master Handset (available separately) must be included as a master handset when using this audio sub master station.
The IE-8HD features a handset for private communication, as well as a selective door release control, chime volume control, and selective calling to sub handset IE-8HD. Door call-in is announced with a four- or two-stroke chime.