Long-lasting, effective odor control. 24 hour odor control for a full 30 days. Use dispenser as a wall-mounted or free standing unit. Air flow vents and battery operated fan disperse fragrance continuously for complete room coverage. Gels absorb odors in the air and convert them to non-toxic, odorless compounds. Patented Fragrance Cassette® Canister includes battery for easy, one step replacement.