4" Battery-operated timer taper features a bumpy texture with a light wax coating. Turns on with a twist of the bottom and stays lit for 6 hours then shuts off for 18 hours. The cycle repeats every day. The time you originally turn the candle on is the time it will come on each day. To reset the time, simply turn the candle off and turn back on at the desired time.Requires 2 AA batteries (not included).