WT-3122A Buying an atomic clock just makes sense. With radio-controlled time you'll never have to set your clock again. By simply selecting your time zone this clock will set itself to the standard national time for your area. Your time piece will always be on the right time so that you'll always be right on time! All La Crosse Technology weather instruments, clocks and watches are calibrated daily to the atomic time standard of the National Institute of Standards and Technology. All instruments default to fahrenheit, inches, mph and all atomic time pieces are tuned to the 60 kHz, WWVB radio signal broadcast by the National Institute of Standards and Technology at Fort Collins, Colorado. Features: -Radio-Controlled Atomic Time -Automatically sets to exact time -Accurate to the second -Automatically updates for daylight saving time (on/off option) -4 time zone settings -12'' Wood Frame Specifications: -Simple Operation: Insert One AA Alkaline Battery (not included) -After signal is received, press Time Zone button to set -Four Time Zone Settings -Daylight Saving Time Option On/Off -Manual Reset Button -Dimensions: 12'' Diameter x 1.5'' Depth