TFA digital thermo hygrometer for checking indoor temperature and humidity to provide a healthy room climate. Maximum and minimum values. Clock and calendar, alarm clock and hourly alarm. Digital clock time displayed. Large clear temperature mad humidity display. Temperature range: -10 to +50 degree C (+14 degree F to 122 degree F), Humidity 20 to 99 percent. Wall mounting or table standing. 1.5 volts AAA battery included. Measures 98 mm width by 104 mm height by 24 mm depth.