Doesn't just mask, truly eliminates odors Febreze CAR Vent Clips slowly release freshness for up to 30 days (on low and under ambient conditions) Attaches easily to vent Select your level of intensity to control how much freshness is released Enjoy the feeling of distant thunder and steady rain with the deep, dramatic fragrance of Midnight Storm Febreze Car Vent Clips attach easily and act instantly Eliminate stubborn vehicle odors and slowly release a refreshing scent for up to 30 days**On low and under ambient conditions Select your level of intensity to control how much scent is released Long-lasting and mess-free Available in a variety of great scents