Wall Mounted Digital Display Clock 8.6 In Multifunction Large Digital Wall Clock Thermometer Hygrometer for Bedroom Item Type: Clock Weight: 528g/18.6oz Material: Plastic shell, ordinary glass mirror, plastic dial Product Size: 20 x 20cm/7.9 x 7.9in Screen Size: 8.6 inches Battery: 3 x AAA battery (shipped without battery) Indoor Temperature Detection Range: 0 Degree Celsius~+50 Degree Celsius (+32 Fahrenheit~+122 Fahrenheit). The indoor temperature below 0 Degree Celsius (32 Fahrenheit) is displayed as LL.L °C &°F, and above +50 Degree Celsius (122 Fahrenheit) is displayed as HH.H °C &°FIndoor Humidity Range: 20%RH to 95%RH. Indoor Temperature and Humidity Detection Period: 60 seconds. When the alarm is ringing, the temperature and humidity is not detected or updated. Indoor test humidity below 20%RH will be displayed at 20%RH, higher than 95%RH, also displayed at 95%RH.