Marathon CL030027 Atomic Wall Clock with 8 Timezones, Indoor/Outdoor Temperature & Date in Silver - Batteries Included HIGHLY LEGIBLE DISPLAY: Features large, easy to read 2" high display SELF-SETTING/ADJUSTING: Using radio frequencies broadcast from NIST's Colorado Atomic Clock 12 OR 24 HOUR: Choose to display the time in 12 or 24 hour format, also shows indoor/outdoor temperature display in Celsius or Fahrenheit 8 TIME ZONES: Choose to display the time in 8 different time zones with option to turn Daylight Savings Time on or off WIRELESS WEATHER SENSOR- Measures indoor or outdoor environmental conditions with precision and accuracy. The sensor features a compact size, weather-resistant design and integrated mounting options.