Give your ride a refresh! Smart Scent™ Vent Clips fasten right onto your car's dashboard vents, so every errand, school pick-up, or commute is filled with your favorite fragrance—up to four weeks for each clip. You'll always know when it's time to replace, as the liquid in the "jar" disappears with use. A helpful tip: The scent diffuses best when the air flowing through the vent is 70 degrees or higher. Want lighter or stronger fragrance? We've included a slider bar so you can adjust the flow. Genius! Try all of our car air fresheners in small spaces (think closets and lockers) as well!