This La Crosse Technology Wireless Digital Thermometer features indoor and outdoor temperature readings, hi/lo temperature records, indoor humidity and trend indicators all on an easy-to-read display. It has a long distance range of 300 ft. (91 meters) and temperatures down to -40 F. The digital thermometer time display can read in a 12 hour standard or 24 hour format, and temperature readings in Fahrenheit or Celsius.