When used with The ReZonate[TM] dispenser, ReZonate[TM] refills produce very small and very light micro particles keeping the fragrance suspended for many hours. Formulation is VOC exempt and contains no propellants or HFCs. One ReZonate[TM] refill cartridge can replaced up to three high volume metered aerosol cans, or up to six passive fragrance refills. These refills offer superior fragrance for up to 90 days.