Self-Setting & Self-Adjusting Wall Clock with Stand, Digital, Battery Operated, BlackThe Marathon Atomic Clock is a self adjusting timepiece that eliminates manual time and date input Easy to read 4 high display Using radio frequencies broadcast from NISTs Colorado Atomic Clock. (Atomic feature only functions in North America) 12 or 24 Hour Display Formats with Indoor Temperature Display in Celsius or Fahrenheit A Marathon exclusive, choose between PST, MST, CST, EST, AST, NST, HST & AKST with option to turn on or off Daylight Savings