16" Brushed Metal Atomic Time Updates for DST La Crosse Technology WT-3161WH All Features: Atomic time with manual setting Automatically sets to exact time Accurate to the second Automatically updates for daylight saving time (on/off option) 4 time zone settings Simple operation: insert 1 "AA" alkaline battery Specifications: Simple Operation: Insert One “AA” Alkaline Battery After signal is received, press Time Zone button to set Four Time Zone Settings Daylight Saving Time Option On/Off Manual Reset Button Power requirements: Clock: One “AA” Alkaline Battery