The 433 MHz wireless PIR sensor is an important item of safeguarding property in smart home automation. On detection of human movement in front of it, the PIR sensor alerts the gateway device instantly which in turn relays the information to the mobile App through the server. The wireless PIR sensor should be installed ad a height of about 5 to 6.5 feet and need not be at the same room where the wireless gateway is installed. Works with Sonoff RF Bridge and also with RF sensing Wifi Pan/Tilt IP camera.