Febreze Car Freshener doesn't just mask heavy and stubborn odors in your car, it permanently removes and cleans them. With the use of OdourClear technology, even the heaviest odors from food, pets, cigarette smoke and garbage are cleaned and removed, leaving a pleasant, fresh scent. This car vent clip is a small stylish air freshener that easily attaches to your car vent. It has a special membrane technology that works with your ventilation system to provide refreshment on the go, no batteries or electricity required. The intensity of the fragrance can be adjusted on the dial of the device. It ensures that it remains effective for 30 days and free from unwanted odors, so that you and your passengers can breathe happily.