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Sonoff Zigbee LCD Smart Temperature Humidity Sensor  SONOFF smart home system allows you to control your electrical appliances remotely with the EWeLink app or by voice with Amazon Alexa or Google Home. It allows you to create different scenarios, group appliances by switching on/off multiple devices with a single touch, set timers and schedules, monitor the status of your devices in real time, and share their control. Thanks to configurable local LAN support Sonoff smart home system can work without a cloud server.  Features: Built-in Swiss-made sensor ensures accurate measurement of room temperature and humidity. The smart device can detect and display real-time temperature and humidity readings on a large LCD screen and report them to the EWeLink app. Connection and configuration are supported directly via the smart app (via Android or iOS smart devices). Temperature switching °C / °F. The device allows you to monitor living conditions in the app, store and export historical data. You’ll receive instant alerts from your phone when the temperature or humidity exceeds your set comfort level. Suitable for environmental monitoring in residential areas, factories, computer rooms, shopping malls, hotels, offices, educational buildings, banks, libraries, as well as warehouses and many other places. Supports Zigbee gateways that use Zigbee3.0 protocol, compatible with most third-party hubs: such as Amazon Echo Plus 2nd Gen, Echo 4th Gen, Echo Show 2nd Gen. Can be combined with various other products for smart home scenarios. Note: CR2450 battery is not included, it should be purchased separately.  Technical data: Screen size: 2.8 inches. Compatibility: Sonoff NSPanel Pro, Zigbee Bridge, Zigbee Bridge Pro, ZBDongle-P, ZBDongle-E, iHost. Wireless protocol: Zigbee 3.0 (IEEE802.15.4). Temperature measurement accuracy: +/-0.2°C. Humidity measurement accuracy: +/-2RH. Operating temperature: -9.9°C~ +60°C. Power supply: CR2450 battery 3V (not included). Battery life: 2 years. App: eWeLink (Android, iOS). Integrated PCB antenna. Encryption standard: AES-128. Wireless network distance: up to 120 m. Body materials: PC+LCD. Dimensions: 62.5x59.5x18.5 mm. Color: white. Weight: 69g. Installation: fixed to the wall with 3M/ magnet/ placed on the table surface. Certificates: CE/ FCC/ ISED/ RoHS.  Warranty: 24 months.