Feature:1. RECHARGEABLE AND REUSABLE: The smart temperature humidity meter support the display of /, has a built in battery and can be charged by USB, and can still be used after power failure2. A VARIETY OF INSTALLATION METHODS: Wall mounted thermometer using bench, wall mounted, magnetic design, easy to install in a variety of places3. APP CONTROL: Through the mobile phone APP can easily operate the hygrograph, set the upper and lower limits of temperature and humidity, and immediately alarm when the temperature exceeds. You can also view historical temperature, humidity, and brightness data4. ACCURATE AND PRACTICAL: The accuracy of the temperature humidity sensor is high, the temperature is 0.3, the humidity is 2%, which is convenient for work and life production5. EXCELLENT PERFORMANCE: Temperature humidity sensor is made with fine workmanship, possess compact appearance and stable performance, can make sure durability and stabilitySpecification:Item Type: Smart Temperature Humidity MeterStatic Current: 30mAHumidity Measurement Range: 0~100%RHTemperature Measurement Range: -19~60(-2.2~140)Temperature Measurement Accuracy: 0.3Humidity Measurement Accuracy: 2%Brightness Measurement Range: 0~100Charging Time: 2 HoursBattery Life: 4 Hours(fully charged)Battery Specification: 1 x 3.7V rechargeable lithium battery 500mAhWiFi Standard: IEEE 802.11b /g/n 2.4GHz(5G not supported).Package List:1 x Temperature Humidity Meter1 x USB Cable1 x Sensor2 x Screw2 x Wall Plug1 x User Manual