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WiFi Wireless Video Doorbell use Core chip Hisilicon 3518e V200 ,add IR CUT element make fast and stable. (Functions:no need registration privacy protection，2-way video intercom no delay , motion detection , picture take , unlock via APP , keypad coded access , tamper alarm , leave message , video record,clear IR lamp , 1 doorbell connect 4users , 1 user connect 6 doorbells , duplex intercom , can be connect with cable) Protocol: P2P Camera pixel: 720P Camera view angle: 150° Resolution: adjustable from 1280*720/640*480 Image encoding: H.264 APP: Support Android/iOs devices Simultaneous users to an outdoor unit: 4 Max doorbell number to an APP device: 6 Image rate: 25fps-30fps Working current: 450mA