Candles have a built-in timer to stay lit for 5 hours, then off for 19 hours, repeating the cycle automatically each day. Candles are dipped in ivory wax and have a realistic, LED flicker-like flame. Each candle requires 2 AA batteries (not included). Set includes two of each size of candle. Small size measures 3" high by 3" wide. Medium size measures 4" high by 3" wide. Large size measures 6" high by 4" wide.