La Crosse Technology WT-3129B 12 Inch Atomic Analog Wall Clock, Black Automatically sets to exact time Accurate to the second Automatically updates for Daylight Saving Time (ON/OFF option) 4 Time zones: PT, MT, CT, ET Simple Operation: Insert 1 AA Alkaline Battery (not included) or ADD 2 additional AA to extend battery life (up to 3 yrs) Accurate, atomic self-setting time & date with automatic resets for Daylight Saving time Black plastic wide frame 4 Time Zone Settings Simple operation with 1 AA alkaline battery Accurate to the Second