It is used for body movement detection in protected indoor area. 
Functions and Specification:
1.Anti-white light with spherical lens and sealed optical design. 
2.Digital processing to ensure accurate and reliable alarm. 
3. With built-in tamper switch and function of self-test and report. 
4.Detection range: 9m (25℃)
5.Transmit range:120m-150m(open area)
6.Power supply:3VDC Lithium battery, battery life about 1 year(battery not included in the package)
7.Infrared coverage area:9m*12m/90°
8.Transmit frequency:433MHz
9.Alarm indication: LED light for several seconds.
10.Installation height:1.8 to 2.5m(6-8 feet) allow 45°angle against wall