Innovative smart programming ensures an equal fragrance release over 30 days. Contains a light sensor to conserve battery lift (change to life) 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: 5.38"; Width: 5.34".