La Crosse Technology WT-3126B 12-Inch Atomic Analog Wall Clock, Aluminum Atomic time with manual setting option Automatically sets to exact time Accurate to the second For precise time in the home or office, 12-inch atomic analog wall clock from La Crosse Technology Aluminum frame with black numerals and hour, minute, and second hands; flat lens covers clock face from dust and debris Daily resets via radio transmissions to US Atomic Clock in Colorado; 4 time-zone setting buttons on reverse Requires separate purchase of 1 AA battery Measures 12 inches in diameter with a 2-inch depth