Febreze AUTO cleans away vehicle odors with Odor Clear Technology so they re gone for good. Simply attach this AUTO air freshener to the air vent to begin cleaning your AUTO of odors and slowly release a light fresh scent for up to 30 days. The scent dial puts 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 Auto. On low and under ambient conditions.