Features: Sensitive Induction: When the magnet is separated from the main body, the door window switch sensor can detect in time. Monitoring & Protection Function: Real-time monitoring of the status of doors and windows to realize the protection function. Rest assured and avoid the hidden danger caused by forgetting to lock the door or closing the window. APP remote control function: Achieve the real-time push function by pushing the status messages of doors and windows to your mobile phone, allowing you to check the status at any time and receive alerts in time. Custom name: When there are multiple sensors at home, you can customize the names one by one on "Tuya Smart" APP to effectively avoid confusion. Smart scene linkage: You can set the scene linkage for the door sensor on your mobile phone. For example, when you open the door, the lamps, purifier and stereo will work together as you wish. Smart alarm: When the door/window is opened about 2cm or the sensor is removed and lifted, the gateway can be informed in time via wireless signal to realize intelligent instant alarm. Wide applications: Position and use, suitable for doors, windows, cabinet doors, furniture drawers, electrical appliances, etc. in homes, hotels, offices and other places. Specifications: Material: ABS Color: White Power Supply: 1 * 3V CR2032 Battery Working Voltage: DC 3V Working Current: & le; 60mA Standby Current: & le; 5A Battery Life: 2 years (10 times/day) Wireless Standard: ZigBee802.15.4 Magnetron Effective Distance: & lt; 1cm Working Environment: -10~+55, 10%~90%RH (non-condensing) Item Size: Approx. 55 * 25 * 10.7mm / 2.17 * 0.98 * 0.42in Item Weight: Approx. 24g / 0.85oz Package Size: Approx. 56 * 37 * 17.5mm / 2.2 * 1.46 * 0.69in Package Weight: Approx. 30g / 1.06oz Note: Please read the user manual carefully before use. Packing List: 1 * Sensor 1 * Adhesive Tape 1 * CR2032 Battery 1 * Reset Needle 1 * User Manual (English)