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The white AT-406 Indoor Handset-to-Handset Audio Only System from Aiphone consists of an AT-206 master and AT-306 sub unit. It provides two-way communication. The call button on the master alerts all subs, whereas the sub alerts only the master unit. Up to 2 additional subs (not included) can be added to the system. Both the AT-206 and AT-306 can be powered by 4 AA batteries or 6VDC power supply (both not included). Any particular station can also be signaled by bell or light, while it rings, using the TAR-3 relay (available separately).
In the Box
Aiphone AT-406 Indoor Handset-to-Handset Audio-Only Intercom System (White)