The alarm sensor can be installed on doors, windows, garage doors, cabinets, mailboxes, pet doors, and more. [Home Intelligent Linkage] Automatically controls connected devices by linking smart door and window sensors. For example, when you open the door upon returning home, your connected devices can activate automatically, enhancing convenience and smart living. Real-time monitoring: Smart door sensors provide real-time protection. When the sensor is triggered, you receive instant app notifications indicating unauthorized access, allowing you to monitor entry points remotely. [App Remote Monitoring] Door and window contact sensors are controlled via the Tuya Smart app or Smart Life app. Download the app from the app store or scan the QR code on the packaging or user manual. Ensure your wireless network is 2.4GHz. Voice control: The wireless smart door sensor is compatible with Alexa and Google Assistant for voice control. Add the Smart Life or Tuya Smart app to your Alexa or Google device to enable voice commands. Power supply: 2 LR03-1.5V/AAA alkaline batteries (not included) Color: White Material: Plastic Package Contents: 1 x Door sensor Only the above package content; other items are not included. Note: Lighting and display differences may cause slight variations in color between the image and the actual item. Measurement may vary by +/- 1-3 cm.