Febreze CAR Vent Clips eliminate vehicle odors so they're gone for good. Simply attach air freshener to air vents to begin slowly releasing freshness for up to 30 days.* Intensity settings put you in the driver's seat, allowing you to select the perfect amount of freshness for you and your passengers. Don't give odors a ride. Eliminate them with Febreze CAR Vent Clips. *On low and under ambient conditions.