This is a uniquely, amazing product by Stephanie Lee. It can last up to a full 3 months! Put it in your cup holder in your car, or stick it in a locker or closet. It comes in all Stephanie Lee's scents. How to use: Take off the black lid and put on the perforated top. The water in the crystals will begin to evaporate slowly. When they get down until it's only about 1/3 of the way full, fill it back to the top line with warm water and within 5 minutes they're back to their original size and emitting more fabulous fragrance!