Our door sensor works great! It's easy to install and use! It is app remote-control. Leading you to a smart life. Come and have a look.Features:* Download app "TUYA" from App Store to add the device to detect the status of your door / window. Home security in your hand all the time.* Simply attach one piece to your door or window, and attach the other piece to the door or window frame.* Battery  powered, convenient for you to replace the battery and easy for you to install with stickers.* Ideal intrusion warning for homes, apartments, mobile homes, dorms, offices, hotel rooms, garages, etc.* Low-consumption design, which can make it work long time.* Simple design with a compact size, elegant and fashion.* This sensor needs to work with Amazon alexa, Google assistant, IFTTT or Rokid.