This large atomic clock sets to absolutely precise time by receiving the WWVB time signal from Colorado every night. It automatically updates for Daylight Saving Time, Leap Year, Leap Minute and Leap Seconds when they occur. It can be set to Pacific, Mountain, central or Eastern Time. Analog thermometer has a temperature range from -10°F to 130°F (-30°C to 60°C) Analog hygrometer humidity range is. 1% to 99% (%RH). Clock: One “AA” alkaline battery (not included). Insert battery, set time zone with a one button touch and wait overnight for the correct time to appear.

• Clock is 18" in diameter and 2.5" thick