... Fix the doorbell on the wall or door with screws or double-side adhesive, Signal strength will ... use, and do video intercom; unlock the e-locks with a touch.2. Wifi intercom Features(1)WIFI ... intercom, and unlock. (2)Clear camera, and equipped with automatic light sensitive chip. If the light is not ... to several mobile phone, PC, or computers.(12)With rain cover and touch key surface, better waterproof ...