Detect open/closed status: It detects open/closed status of door/window and use it for doors, windows, cabinets, drawers, mailboxes or anywhere you want to be notified when opened or closed. Capture every activity and send alerts to your smartphone. Help you pay attention to the security of your home anytime and anywhere. ^ Anti-tamper alarm function: No need to worry about someone trying to break into your home by stealing from the door/window or destroying the door sensor. The WiFi door sensor has an anti-tamper alarm function, and you will be notified immediately. Its time to update your home security^ Supports two charging methods: battery powered and USB charging. The battery type is CR123A and the battery is replaceable. The USB port cannot be used to charge the battery. You want the sensor to work longer and then use USB to charge it. ^ Only supports 2.4G wireless type: It connects to your smartphone via app in 2.4G Wi-Fi environment. If your WiFi router only supports 5G, devices will not be able to connect. ^ Third-party support: Works with Alexa and Google home. It works with other third-party home wifi smart devices to improve your home security. Technicians can DIY to discover more usage scenarios and create a smart scene for WiFi devices to work together.