Fangrui Product Details Features: Ensure Safety Of Your Family With This Door And Window Sensor, Providing Peace Wherever You Are. Convenient And Easy To Use, This Sensor Detects Openings And Sends Notifications To Keep You Updated. Suitable For Various Situations, This Sensor Help Protect Your Belongings By Alerting You When Door/window Are Accessed. Control Of Your Living Environment With This Sensor, Allowing You To Automates Tasks And Create Simple Experience. Stay Connectes And In Control With This Sensor, Enhancing The Security Of Your Home Easy. Specifications: Material: Abs Size: About 502511mm & 301510mm Wireless Protocol: Zigbee3.0 Sensings Distance: 15mm Operating Voltage: 3v Standbys Current: 23ua Light Range: 0~10000lux Accuracy: 50lux Standbys Time: 12 Months Operating Temperature: -10 ~ 55 Working Humidity: 0- Wireless Distance: 50m (open Distance) Installation: Adhesive Package Includes: 1 Set Door Sensor Note: Please Allow 1 To 3cm Error Due To Manual Measurement, Please Make Sure You Not Mind Before Your Bid, Due To The Differences Between Different Monitors, The Picture May Not Reflect The Actual Colorful Of The Item.