Metal enclosure with solar technologyQBUC Car Fragrance Diffuser made of zinc alloy with solar fan blade robust and easy to install. Improve Air Quality: Also as an aromatherapy,our air fresheners come wtih a Cologne aroma ring that improves air quality and keeps the air fresh,feel like in nature. Giving you a good mood everyday. Long-lasting Fragrance: The fragrance of the scent ring is even and lasting, bringing you a comfortable driving experience.Usually the aroma can about 1 monthsoptimal use time is 1 months.After one month, the smell will gradually weaken.Put it into the QBUC solar air diffuser correctly, the aroma will automatically come out. Available to pregnant women and babies. Color:Blue, Black, Grey(optional) Package List: 1 x Car Air Freshener 3 x Fragrance tablets