This schoolhouse radio-controlled wall clock sets itself automatically. Radio-controlled clock features: Time adjusts automatically based on signal received from WWVB station in Fort Collins, Colorado. It automatically adjusts for daylight savings time. This clock receives signal throughout continental United States and most of Canada. It is very easy to operate this clock-- Insert AA battery then press time zone button. The clock will receive the signal and set itself overnight. This clock has pendulum that continously swings.