Product Name: Door Window Magnet Enter Alarm 4PCS Blister Card Packing Model NO.: 323 X4 Certification: CE, FCC, RoHS, CCC Voice: Alarm Sound Trademark: Longriver Transport Package: Blister Card or Box Specification: 50PCS/CTN Origin: China HS Code: 8531100000 Product Description 1. 3PC AG13 LR44 battery.(included)2..peel the paking of the alarm unit and place it on the edage of the moveable portion of the ON/OFF switch side away from the edge.4.peel the backing of the magnetic sensor and place it on the edge of the oppsite side next to the alarm unit.Please check its sensitivity monthly, to make sure it is in good condition. Change batteries every 3-6 month.Specifications:Warehouse roll up doorsInside display cabinetsRestricted area protectionpatio, bedroom, bathroom) window alertHome SecurityHefei Long River Electrical Co.,Ltd.Tel:+86 13956994028,www.anhuibell.com