Innovative smart programming ensures an equal fragrance release over 30 days. Contains a light sensor to conserve battery lift so the unit only works when the room is in use. The smart chip controls the programming so the fan runs sparingly in week 1 and gradually turns more frequently over the 4 week period, helping release the same amount of fragrance over 30 days. Material(s): Plastic; Color(s): White; Height: 5.34″; Width: 5.34″.