1. Home hygrometer, data can be clearly read in various 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 highLED digital display, you can temperature, humidity Voltage:DC2.5V- -3VBattery:CR2032(include)Wireless Connection:Bluetooth-compatible 4.2 Measure range:0C-60CTemperature display resolution:0.1CHumidity range:0%99%RHHumidity display resolution:1 %RHMaterial: ABScolour: WhitePackage Contents:4 x for Thermometer Hygrometer 2Only 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.