1Built in human body sensor (PIR), real time perception of the front door dynamics, when someone appears outside the door, the first time to record the video, you can playback the historical record through the APP. 2With ultra clear infrared night vision function, 4pcs 850NM high power infrared lamps, dual filter automatic switching, 120 wide angle viewing angle, motion detection. 3It adopts low power consumption technology, no wiring, easy installation, effective use for more than 8 months, convenient for energy saving, and the battery can be recharged. 4The mobile phone supports APP real time monitoring, with a simple interface, actively wake up monitoring anytime and anywhere, and intelligently push suspicious videos. 5WIFI long distance signal transmission, guests can make video and voice calls when visiting, and make short term video recording, and wireless WIFI connects multiple users to watch online at the same time.