Tired of trying to synchronize clocks throughout your building? This clock does it for you! Each day the self-setting wall clock picks up a radio-transmitted signal and automatically sets the time to match the atomic clock at the National Institute of Standards and Technology. Easy to set up for all U.S. time zones—it even auto-adjusts for daylight savings time! 14-1/4"-diameter clock. Convex glass lens and black plastic case. Powered by one AA battery, not included.