Product Features: 1. Instant NotificationPush instant notification to your phone immediately when door or window is opened or closed. Keeping you informed all the time.2. Alarm AlertWhenever the sensor is triggered to open/close, it will send alarm to alert you that someone opens your door or window.3. Alarm RecordingSupport checking open / close records and battery level on the app. Never worry about missing any important moments or running out of battery.4. Device ShareSelect Home Management in the Me page to share your added sensors with family members. so that they can also monitor the status of doors/windows.5. Low Voltage RemindWhen battery level is low, it will automatically remind you to change batteries, never worryabout running out of battery.6. Works with amazon alexa and Google Assistant Tuya Zigbee Hub Requested This door sensor doesn't work alone. It doesn't need to work with Tuya ZigBee hub to function Product Parameter: Battery: DC 3V (CR2032 Included) Battery Life: Over 1 Year(20 times/day)Wireless Type: Zigbee 3.0 (Only Support Tuya Zigbee Hub)App Remote Control: Smart lifeMaterial: ABSSize: (Main body): 52.5mm x 26.5mm x13 mm(Small body): 34.5mm x 12.5mm x 13 mm Protect your home 1, Real Time Alert and Notification2, Open or Close Detection3, 7*24 Protection Remote Monitor: 1, Share Devices to your Family2, Remote monitor Anywhere and Anytime3, Colud Event Recoreding Voice Control Works with Amazon Alexa, Google Assistant By connecting App to Amazon Echo, Google Home, you are able to voice control your home appliances. For example: -Alexa,Is my front door locked?; -Yes . the front door is locked Easy Installation 1. Two installation methods: double-sided tape, screw set2. No tools needed3. Easy battery replacement Low battery reminder Where to install? 1, Doors, windows, drawers, mailboxes, garages, cabinets, as long as there is any place to open and close. But please note that the equipment is not waterproof, please be indoors or where the water is not drenched.2, It can protect your home, business, or anywhere Zigbee signal can reach. Purchase Suggestions The door and window that enter the house need to install a sensor to protect your home completelyWireless transmission up to 400ft, do not worry about network problemsIt is recommended that you buy more than one. How to install? 1. There are 3M adhesive taps in the package. You can use them to install anywhere you want. They are very firm. Please don't worry.2. Make both bodies as close as possibel, the gap between two bodies is <10mm.