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Deluxe 13 1/2" Indoor/Outdoor Atomic Clock, 13.5" Overall Diameter, Black Case, 1 AA (sold separately)

Quick Overview

Weather-resistant case and large, easy-to-read numerals.
Maintains radio contact and automatically synchronizes with the National Bureau of Standards' atomic clock in Boulder, Colorado.
Automatically syncs up with Daylight Savings Time changes within the continental US time zones.
Hour, minute, and second hands sync with local time.