TFA easy base wireless thermometer is indication of indoor temperature. Transmission of outdoor temperature via transmitter (maximum 100 meter). Permanent indication of highest and lowest values with time and date of recording. Radio controlled clock with date. Temperature range: indoor -10 to +40 degree C, outdoor -40 to +60 degree C. 1.5 volts AAA batteries required but not included. Measures 95 mm width by 137 mm height by 20 mm depth.