Nilotron Air Fresheners contain unique fragrances blended to freshen the air for up to 24 hours. The 7 oz. Nilotron refills contain 3,100 metered releases. Use with Nilotron automatic dispenser or by hand Cost-effective aerosol refill is designed for use with the Nilodor dispenser Scents will last approximately one month and has an effective range of 4,000-6,000 cubic-feet It contains about 3,000 metered sprays