Freshens your car for 30 days Otto makes any ride smell great for a full month since it contains 10X more fragrance than typical car air fresheners. A breath of fresh air for your car Otto comes in three great fragrances allowing you to breathe easy no matter where the road leads you. Easy to use Otto has no messy oils, gels, or liquids that can break or spill, and is a breeze to use. Simply open the package, and place it under the seat (out of direct sunlight) for month long freshening.