Big D THE D-TOWER DISPENSER is specially designed to hold THE D-TOWER REFILL (sold separately). It can be placed in bathroom stalls, restrooms, offices, hallways, kitchens, etc THE D-TOWER REFILL is the exciting passive deodorant cartridge for freshening the air in any size space. Forget about liquid spills or accidents, as the solid design of the cartridge eliminates the mess. No batteries are needed. THE D-TOWER REFILL will keep any area smelling fresh for 30 to 45 days and is made from 100% recyclable material.