Wi-Fi Door Sensors Set Real-time Alarm Window Open Contact Detector Intelligent Home Safety Equipment Compatible with Alexa&G-oogle Features: Intelligent Wi-Fi door and window detector for daily-security. Supports remotely send alarm. When the door or window is opened illegally, the detector would send alarm signals to your smartphone. Powered by button cell with long service life, low energy consumption. Wide application, can be installed on doors, window, safes, drawers, ect.  Easy installation, no tools required, just stick on the places you need. Specifications: Material: plastics Color: white Working voltage: 3V Quiescent current: <=8μA Transmission distance: 25-35mm Low voltage alarm: 2.2-2.4V Coding format: 1527 Emission frequency: 433MHz Power supply: CR2450 button cell Working environment: -10~50℃ Package size: 90 * 50 * 25mm / 3.54 * 1.97 * 0.98in Package weight: 50g / 1.76ounces Package List: 1 * Intelligent Door Detector Set 1 * User Manual