1-Pack Smart Door And Window Sensor, 2.4G Wifi Door Sensor, Tuya/Smart Life Installation and Pairing: You can pair this sensor with TUYA's most smart outlet plug switch smart bulbs with the Tuya Smart or Smart Life app, or check the instantaneous state of Alexa or Google Assistant. WIFI DOOR SENSOR W/ THE FREE APP NOTIFICATION: Smart security sensor, "Tuya smart" or "Smart life" app control; when door/window is opened or closed, the sensor will push app notification alerts to your smartphone. No more need to be afraid someone enter your home without permission. You can also share Wireless Security Sensors with your family, they can check the status and get notified at the same time. HOME AUTOMATION: Extend your smart home automation with a Wi-Fi door sensor; Set up your smart routines in the Tuya Smart/Smart Life app or Alexa; For example, Automatically turn on your smart wall switches or lights when the door opens(A delay of 6-8s is normal in the hibernation state?. Keep an effective distance between the wifi door sensor and the router at 20m/100ft. COMPATIBLE WITH ALEXA AND GOOGLE HOME: No hub required and No fees charged. Pair our Smartlife app with either Alexa or Google Home, you could say, "Alexa, is the door closed?" Enjoy knowing the status of your door sensor without needing to use your phone. SMART HOME SECURITY SENSOR: 0.78 IN wide gap allowed. Without tools, Easy to install the window sensor with the included 3M sticker, firm and durable. You can install the Alexa door sensor on front doors, garage doors, liquor cabinets, windows, pet doors, and more. The contact sensor is also a good option as a mailbox sensor. LOW POWER WARNING AND SERVICE: The sensor door needs TWO AAA Batteries(Not included). When the battery is running out, you will receive an App notification, Don't worry about missing any moment. If you have any questions about the smart door sensor, please contact our customer - service anytime. We will solve it for you and make you satisfied.