Use your car's climate control system to dispense long-lasting fragrance with these mini diffusers from Refresh Your Car! Simply attach this diffuser to any vent in your vehicle and adjust the dial to your strength preference—the fragrance fills your cabin automatically when the climate control system is turned on. Use your car's climate control system to dispense long-lasting fragrance with these mini diffusers from Refresh Your Car!. Simply attach this diffuser to any vent in your vehicle and adjust the dial to your strength preference—the fragrance fills your cabin automatically when the climate control system is turned on.