This Marathon atomic clock is self-adjusting and self-setting, eliminating the need to manually input the time and date. Simply insert the batteries provided with the clock and it will synchronize to the time set.The time and date are radio-controlled. The current time and date are automatically synchronized with the time signal transmitted from DCF station in Europe. The clock’s elegant, transparent, acrylic outer frame and large numbers making this beautiful clock ideal for home, office, school, hospital, etc. It easily hangs on a wall or can be placed on a table top using the sturdy fold-out stand. Split-second accuracy shows the time in either AM/PM format or 24-hour military timing, along with the month, weekday and date, as well as indoor humidity and room temperature in Celsius or Fahrenheit.