Feature: 1. Real Time Alarm: The door sensor uses WiFi connection. Once a door or window is opened or closed, it will send a notification to your phone to alert you if someone is entering or leaving. 2. Remote App Monitor: With app called for Tuya Smart, you can remotely monitor and control the status of doors and Windows, open or close doors and Windows from anywhere, ensuring the safety of your home. 3. Compatible for Tuya Home: Door open detectors can be interlinked with other smart devices, such as cameras, alarms, etc. When the door and window are opened, you can view it in real time through the camera, or trigger the alarm to make a sound. 4. History and Reminder: The device records the status of the door and window switch and displaying it in the app. You can also set reminders to stay alert, such as at night or when you are not home. 5. Low Power Design: This door magnetic detector uses a low power design, long operating time, no frequent battery replacement, saving the trouble and cost of battery replacement. Specification: Item Type: WiFi Door Window SensorMaterial: ABS Battery: AAA lithium battery x 2 (shipped without battery). Package List: 1 x Door Magnetic2 x Double Sided Tape 4 x Screws 1 x Instructions 5 x Other Accessories