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Accurate Time — All the Time This La Crosse Technology analog wall clock is “Atomic” (ie “radio controlled”). It sets itself using transmissions received from the U.S. government, which include precise timing information from the U.S. Atomic Clock in Colorado. Radio Controlled Time: Hour, Minute, Second Automatically sets to exact time Automatically adjusts six times daily to exact time Select from four US time zones Simple operation: insert one AA Alkaline battery, press time zone and wait for signal Can disable Daylight Saving Time Actual Size: 12.5″ in Diameter Yardiac.com Exclusive 2 Year Guarantee