1. Home hygrometer, data can be clearly read in brightness and angle. 2. High sensitivity and accurate sensirion from Switzerland, sense change of temperature and humidity a breath . 3. An expression to spell over comfort level, cute and simple. 4. Low consumption screen, a CR2032 button battery for one-year. 5. Built-in advanced Sensirion temperature and humidity sensor, temperature accuracy: 0.1 degrees, humidity accuracy: 0.1 percent RH. Via Mi app to switch on humidifier when indoor humidity is too low and air-conditioner when indoors temperature is too high LED digital display, you can temperature, humidity :DC2.5V- -3V Battery:CR2032(include) Wireless Connection:Bluetooth-compatible 4.2 Measure range:0C-60C Temperature display resolution:0.1C Humidity range:0%99%RH Humidity display resolution:1 %RH Material: ABS colour: White Package Contents: 4 x for Thermometer Hygrometer 2 Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.