The INO 30-day premium metered air freshener refills are compatible with the INO Elite Pro 90 dispenser as well as all other dispensers available on the market. When using with the INO Elite Pro 90 dispenser, set the control at 30. When using with other models of dispenser, follow manufacturer's instructions in odor to obtain a shot every 15 minutes. Product can be used in all rooms and locations requiring a quality odor control solution using aerosol cans. 3000 shots or one shot every 15 minutes for a 30-day period. Low 30% VOC content. CFC-free mix.