? Long-lasting effective odor control for restrooms, hospitals, nursing homes and commercial buildings Air flow vents disperse fragrance for 24-hour odor control. Each unit holds a battery-operated Fragrance Cassette (RCP 5119, RCP 5120, RCP 5121, RCP 5122 and RCP 5123), sold separately, for consistent fragrance release over a 30-day period. Wall mount (tape and screws included) or use as freestanding unit.