Treatlife Wifi Smart Door Sensor 1 Pack, 2.4Ghz Window Alarm Sensor, Wireless You can install this door and window alarm quickly without hubs or wiring. It comes with strong double-sided adhesive and you can monitor your home from anywhere via the app. The built-in AAA battery lasts for 2 years, and you can receive instant alerts for unexpected openings. The alarm also integrates with other Treatlife smart products and is compatible with Amazon Alexa and Google Assistant. Easy to Install: The Treatlife wifi door sensor is designed for effortless setup, requiring only a 2.4GHz WiFi connection (not compatible with 5G). No hubs or wiring are required. Simply use the included 3M adhesive sticker for quick, secure attachment?ensure the surface is clean and dry for optimal adhesion. It accommodates gaps up to 0.39 inches (1 cm) wide and offsets up to 5mm. Package includes 2 AAA batteries, 2 pieces of adhesive sticker, 1 door sensor, and 1 user manual Instant Alerts and Device Sharing: Get real-time notifications on your smartphone whenever a door or window opens or closes, allowing you to monitor your home from anywhere via the Treatlife or Smartlife app. No more need to be afraid someone enter your home without permission. You can schedule timing for alarm enable/disable like from 10:00pm to 6:00am etc. You can also share wireless security sensor with your family, they can check the status and get notified at the same time Multiple Application Scenarios: You can install the contact sensor on the front doors, garage doors, windows, mailboxes, safes, cabinets, and more. Watch the security barrier at the top of the stairs or in your child's room. The smart window sensor can control other Tuya smart connected devices as the status of the door or window changes. For example, automatically turn on your smart lights when door is opened 24/7 Whole-home Protection: The Treatlife window door sensor gives peace of mind, anywhere, anytime. Work with the Treatlife app and support 3rd-party integration with Alexa and Google Home. Set an Alexa routine to say "welcome you home." All "open" and "close" history will be saved with no charge on the APP up to 7 day Low Power Warning and After-Sells Support Service: Door open alert powered by 2*AAA batteries(Included). Enjoy over six months of battery life with this door alarm sensor. When the battery is running low, it will automatically push messages through App to remind you to change battery, ensuring continuous protection. If you have any inquiries, please don't hesitate to reach out to us