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The CoviSec ALV-416BW is a 2-Wire Black and White Video Door Phone Intercom System with one of the easiest installation platforms. It features night vision and 2 way audio so you never have to open your door without knowing who is there. The sleek and elegant 4" monitor is a welcome addition to office or home decor. The ALV-416BW allows additional monitors to be connected thus allowing you to view your door from more than location.