TFA basic wireless thermometer is easy to read digits. Wireless transmission of outdoor temperature via transmitter (maximum 100 meter). Indication of indoor temperature. Maximum and minimum function. Radio controlled clock with alarm and snooze function. Wall mounting or table standing. Temperature range: indoor -10 to +38 degree C, outdoor -40 to +60 degree C. 1.5 volts AA batteries required but not included. Measures 74 mm width by 158 mm height by 27 mm depth.