Wifi door sensor only supports Wifi 2.4GHz - Smart door sensor comes with AAA batteries. You don't need to prepare batteries for the door magnet in advance | Voice Control - Smart door sensor detector is compatible with Amazon Alexa and GoogleAssistant to realize voice control. Just add Smart Life app or Tuya App to your Alexa or GoogleHome App. For example, you could say, "Alexa, is the "Device' Name>" Closed/Opened?" | Create an Alexa Routine - Automatically turn on / off your smart home device by connecting the Smart Door and Window Sensor to other smart home devices. For example, When you come home and open the door, your home will automatically light up, and the Amazon Echo Dot play music. | WIFI door and window sensor alarm - When the door/window is open or closed, the sensor will push the app notification alarm to your smartphone. You can share wireless security alerts with your family. | EASY INSTALLATION - Comes with metal screws and 3M tape. No need for complicated tools and steps to install the window sensor.The smart door magnet can not only be installed on doors and windows, but also can be installed in garage door, wine cabinet, mailbox, safe box, pet door, etc