The Yankee Candle Balsam & Cedar smart scent vent clip is a festive addition to your car. Plus the balsam, aromatic cedar wood and juniper berry blend together in a fresh forest scent. Just clip into your cars vents and the scent starts to fill your car! Fragrance life of up to 6 weeks. Size: 0.13 ounce. The odor-neutralizing unit fastens securely to your vehicle's dash vents. The fragrance is released as the air flows from vents. Smart Scent(tm) Vent Clips work optimally in temperatures of 70 degrees or above flowing from the vent. You may adjust the strength of the fragrance using the slider on the back of the vent clip.