Dimensions: Receiver: 12.5" Diameter. All Features: 12.5" Wood. Atomic Time. Updates for DST. 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. 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