Battery-operated Nilodor® Automatic Aerosol DeluxeDispenser sprays your favorite fragrance at regularintervals to control odors around the clock. Three settingsallow you to select 7- 15- or 25-minute intervals. Convenient on/off switch lets you shut dispenser off when not needed Red indicator light signals when aerosol needs replacing Orange indicator light alerts you it's time for a battery replacementRequires two size D batteries (not included). 6. 75 oz aerosolscents will last approximately one month. Effective range is4 000-6 000 cubic feet. Ideal for grooming shops kennels andclinics.