This product includes three magnetic sensor alarm and three remote controller， it is an effective door or window alarm that can be activated from the remote control. Easy to mounted to door / window with attached double-side adhesive tape. Compact door / window alarm is a perfect helper to protect your house or store.Feature:1.One magnetic sensor can match with at most 8 remote controller freely.2.One remote controller could control several magnetic sensors3.Excellent home use product， tiny and fashion 4.Alarm and door bell function for your option5.Low energy and long work time6.Simple install7.Anti-theft alarm function， entrance remind function8.Application places: home， workshop， office， store， etc.Specifications：Magnetic Sensor Parameter:1.Voltage: 3V， 2 x AAA battery2.Stand-by Volume: 100μA3.Alarm Volume: 30mA4.Frequency: 433MHz5.Alarm Response Time: 200ms6.Stand-by Time: 8-12 months7.Size(L x W x H): 85 x 43 x 17mm8.Color: Black9.Working Environment Temperature: -10 to 60 degree Celsius10.Working Environment Humidity: < 80 percent11.Storage Temperature: -20 to + 70 degree CelsiusRemote control1.Voltage: 12V 27A x 12.Stand-by Volume: 1μA3.Working volume: 15MA4.Stand-by time: 8-24months5.Remote control distance: 20m6.Size(L x W x H): 60 x 30 x 11mmNotes:1.Please make sure the arrow of the magnetic align the magnetic stick， magnetic stick stripe on the right side of the magnetic sensor， when the door is closed， the distance between magnetic sensor and magnetic stick should less than 10 mm.2.Only use in indoor， banned in outdoor use.Package Included:3 x Magnetic Sensor (batteries not included)3 x Magnetic Stick1 x Remote Control1 x User Manual