CLOCK,IND/OUT, ATOMIC,BK

A fully sealed, weather-resistant case and large, easy-to-read numerals on its face make this clock ideal for high-humidity, outdoor environments. As it maintains radio contact and automatically synchronizes with the National Bureau of Standards' atomic clock in Boulder, Colorado, it can be relied upon for up-to-the-minute accuracy and precision. For added convenience, it also automatically adjusts during Daylight Savings Time changes. Time Format: Standard; Power Source(s): 1 AA (sold separately); Movement Type: Atomic/Radio Controlled; Overall Diameter: 13 1/2\".