Product Name: PIR Motion Sensor Door Chime/Alarm Model NO.: 101 Receive Frequency: No Alarm Volume (within 1m): ?110dB Transmission Mode: Alone Working Principle: Infrared Application: Indoor Certification: CE, FCC, RoHS, CCC Working Mode: Active Signal Transmission: Instant Type: Infrared Detector Voice: Dingdong and Alarm Sound Trademark: Longriver Transport Package: Blister Card or Box Specification: 50PCS/CTN Origin: China HS Code: 8531100000 Product Description infrared detector, motion-activatedDetection area: 0-5meterslong and 110 degrees wideSupport 220V Charger(not included)Do not fix this senor near Heating materialsPlease check its sensitivity monthly, to make sure it is in good condition. Change batteries every 3month if you do not use 220V charger.Alarm Power Supply: 2x 1.5v AA batteries (not included)Specifications:Warehouse roll up doorsInside display cabinetsRestricted area protectionpatio, bedroom, bathroom) window alertHome SecurityPackage Contents:1 xAlarm sensor2 xRemote control1 xMount bracketHefei Long River Electrical Co.,Ltd.Tel:+86 13956994028 ,www.anhuibell.com