This item is Infrared Detector with alarm. Install it in a certain height, it will detect human or animal within 4m distance and 120 degree range. Once it detects human passing back and forth, it will call set phone number and LED light will flash. You can also call the detector to hear the sounds within 10m range of the detector.Features- Color: Black- Material: Plastic- Size: 4.5x3x1.5cm- Band: 850, 900, 1800, 1900- Working time: 15~20days (Infrared On), 5~7days (Infrared Off)- Automatically call set phone number while detecting human body.- Call the detector then you can hear sounds within 10m range.- Once it detects human passing back and forth, it will call set phone number and LED light will flash.- LED indicator light for displaying different statuses.- Install it in a certain height, it will detect human or animal within 4m distance and 120 degree range.Suitable for home, inpatient ward, factory, base station tower, and etc.Packing list1 x Detector_x005F_x000D_1 x Power Adapter