For consistent fragrance release over a 30-day period. Holds battery-operated fragrance cassette Rubbermaid? Commercial 9C8301, 9CC8401, 9C8601, 9C8701 (sold separately). Wall mount with tape or screws (incl.). Use in rooms up to 600 sq. ft. Material(s): Plastic; Color(s): Black/White; Depth: 3 5/8"; Height: 7 3/4".