The detector adopts the advanced digital processing technology. It has the functions of automatic temperature compensation, low voltage alert, intelligent energy conservation etc. It will transmit the wireless signal to trigger the host to alarm by detecting the infrared heat energy of human body. It has the advantage of little environment affection, low false alarm, easy installation, and reliable and safe use etc.2. Function introduction: Turn on the switch of the detector. When it detects the infrared heat energy of human body, the LED light will be on and it will transmit the wireless signal. The host will alarm after receiving the wireless signal from it.3. Pair with the alarm host: - Only after the detector pairs with the alarm host, the host can receive the alarm signal from it.- Pairing method: Make the alarm host etc