Feature [Make your door/window smarter ]-when you leave home,it will push notification to you if the doors or windows are opened or invaded by an external boject, you will find anomalies in your home immediately[Creat Smart Home ] Create smart scene on Tuya Smart APP , your smart light can be automatically turned on when you open the door[Battery Wi-Fi powered ]- full of power long durable ,replace the battery is simple,service more intimate[ PLUG & PLAY with Tuya/smartlife APP ]-No hub required,simple download teh "tuyasmart"app on iOS and Android. Your personal butler&receptionist Instant notification to your phone immediately when door or window is opened or closed. With KERUI door window sensor, you don't have to worry about your baby going out of house without notice, and easily know when your aged parents leave or arrive home, even can be clear when someone enters your shop,office and company reception,etc.Keeping you safe and informed all the time. Lighting Automation Create smart scene on Tuya Smart APP , your smart light can be automatically turned on when you open the door Full peace of mind KERUI door open sensor provides 24-hour monitoring. Even you are far from your home,garage,car,shed,and garden,etc,you can check whether the door/window is open with free Tuya app anytime and anywhere,giving you a full sense of security. Works with Alexa/Google Assistant Simply use your voice to control the connected devices by Alexa or Google Home. It can also perform auto control together with other smart devices which are compatible with Smart Life. Convenient for you to detect your doors, windows, cabinets, drawers or anywhere you want to notified when it is opened or closed. Everything is under control Support checking unlock / lock records and battery level on free Tuya app.Never worry about missing any important moment or running out of battery.If you install more than one KERUI smart wifi door sensor in different places. All the status of doors and windows will be displayed simultaneously within the app so that you can easily know what you want at a glance Easy to Install No complicated installation tools are required. The sensor can be installed with double-sided adhesive tape or screws(included) in just a few steps, and download an app "tuya" or "Smart Life" from GooglePlay or App Store to add the device to detect the status of your door/window. Tuya Doorsensor Specifications: Battery: AAA1.5V x 2 (Batteries not included)Standby current: 5uAProtocol: IEEE 802.11b/g/nOperating Temperature: -10 40 (14°F104°F)Operating Humidity: 20% 85%Storage Temperature: -10 60 (14°F 140°F)Storage Humidity: 0% 90%Standby time6 - 12 monthsWireless Type : 2.4GHzSize:Main body : 7cm x 3.8cm x 1.5cmSmall body : 5cm x 1.5cm x 1.5cm