La Crosse Technology WT-3122A 12.5 Inch Cherry Wood Atomic Analog Clock, 12.5", Walnut Cherry Wood veneer finish Atomic Time with Manual Setting Accurate to the Second Automatically Updates for Daylight Saving Time (On/Off Option) 4 USA Time Zone Settings Simple Operation: Insert 1 AA Alkaline Battery 12-1/2-inch wall clock with automatic setting to U.S. Atomic Clock Classic wood frame with white dial face dresses up any room Radio controlled time sets automatically and changes for Daylight Savings Time Manual setting for use outside US time zones and where DST isn't used Requires one AA alkaline battery (not included); battery lasts approximately 1 year