Product Discription: 1.Smart WiFi Control:Easily monitor temperature and humidity in real time from anywhere,anytime. With an external temperature sensor probe,the hygrometer thermometer is proper for incubators, greenhouse, reptile tank, guitar case, restaurant and office. 2.Work with Amazon Alexa, Google HomeAfter connecting Amazon Alexa and Google home, you can know the current temperature humidity by voice. 3.Backlight LCD Display:2.9-inch-LCD display features backlight,making it easier to read in dim light conditions and can check temperature humidity,brightness,time,date. 4.Smart Message & Buzzer Alarm Alerts:Create scene via smart life app,and push notification when the temperature or humidity goes out of preset value and the sensor will make sound to remind you of the alert.stay ahead of air changes in your wine cellar, room, greenhouse or home. 5.Backup battery option:The sensor are powered up by USB cable and have a rechargable battery as a backup battery which can be used for 4 hours after power failure Product paramete r Wi-Fi system: IEEE 802.11 b/n/g 2.4GHz Working voltage: 5V Quiescent current: 30mA Humidity measurement range: 0~100%RH Temperature measurement range: -19~60C (28.5~42.8F) Battery Specifications: 3.7V/500mAh Brightness measurement range: 0~100% Temperature measurement accuracy: 0.3C Humidity measurement accuracy: soil 2% Charging time: 2 hours Built-in battery usage time: 4 hours (fully charged) Size: 86*86*22.8mm 1. Remote Control You can remotely view temperature humidity via smart phone using the app,tuyasmart or smart life. 2. Real-time update of brightness, temperature or humidity. Humidity values can be manually corrected 3. Temperature Unit Selection in APP You can choose or as the temperature unit through app. 4. Third-party Voice Control Works with amazon alexa, google assistant. 5.Battery Life Built-in 500mAh lithium battery, the use time is about 4 hours 6.Time/Date Show time and date after connected with internet. 7.Muiltple connection User can use the app to add our device in smart life app in 3 ways.Bluetooth or wifi or hotspot