Tips for purchase: This product is Zigbee version, Users must have/already bought a tuya zigbee hub to operate. If without a zigbee hub, then such model will not work. Tuya Smart Zigbee Door Window Contact Sensor Wirele Detectors Open/Close Support Smart Life App for Alexa Google Aistant Product parameters: APP name: Tuya Smart or Smart Life Battery type: AAA1.5V*2 (Not include battery in shipment) Low-battery remind function Controls can be done by "Smart Life" APP, Operate easily! Working distance: 15mm Wirele Standard: Zigbee 3.0 WiFi Band: 2.4GHz Working temperature: -10~55 Working humidity: 10%~90%RH Product package included: 1xdoor Sensor (Not include battery) 1xsticker 1xUser manual Product Image: The door sensor must work with tuya zigbee gateway!! [ Easy to Install ] -Clean the mounting area, then use the 3M adhesive tape to secure the main sensor on the fram of the door or window. Align the secondary sensor on the main sensor and secure using the smaller adhesive tape. This door sensor can be used not only for doors or windows, but also for drawers, garage doors, etc. Product Features: 1. Wifi+Bluetooth Dual Mode Connect to the network faster. The connection network speed is 2 times faster than only Wifi. (Bluetooth is only used for network signal connection, Bluetooth cannot be used alone. WIFI+Bluetooth is more stable) 2. Instant Notification Push instant notification to your phone immediately when the door or window is opened or closed. Keeping you informed all the time. 3. Alarm Alert Whenever the sensor is triggered to open/close, it will send an alarm to alert you that someone opens your door or window. 4. Alarm Recording Support checking open/close records and battery levels on the app. Never worry about miing any important moments or running out of battery. 5. Low Voltage Remind When the battery level is low, it will automatically remind you to change batteries, never worry about running out of battery. 6. Intelligent Linkage The door sensor can be linked with other smart devices in the home and make your home more smart after connected with zigbee hub. Low advantage design to ensure long-term battery life. For example, the light will be on automatically when the door is open. (Note that the light needs to be used with WIFI switch). 7.Third-party voice support This sensor supports Alexa and Google Home Aistant. 9. Easy to Install: No complicated installation tools are required. The sensor can be installed with double-sided adhesive tape or screws(included) in just a few steps, and download an app "tuya" or "Smart Life" from Google Play or App Store to add the device to detect the status of your door/window.