"Channel Vision 2 Door Telephone Entry Controller Brand New, The P-0921 provides communication between two different Channel Vision Front Door Intercoms and any phone in the house
When a visitor presses the doorbell button on the front door intercom the phones in the home will respond with a distinctive ring. The home owner can then speak to the visitor at the Front Door Intercom by answering any of the ringing phones in the home. Features: Doorbell Chime Option, Whole House Audio Paging With Use Of P0925 Paging Module, Supports Up To 4 Door Intercoms."
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