Smart WIFI doorbells nowadays form an integral part of our homes. This model has quite a number of advantages. With PIR (Pyroelectric Infrared Sensor), a message or call can be sent if somebody move around the door bell. Secondly, the IR night vision will activate when light goes less than 2Lux. At the press of the door bell button, the video and microphone will activate system prompt and voice intercom. It also comes with an anti-theft screw to avoid the device from being disassembled.