Easy Scent by Lampe Berger Refill Cartridge, Brainstorming Fragrance Each Refill cartridge is fashioned out of a high performance polymer with an outstanding capacity for absorption of the essential oils. Each cartridge is designed to optimize airflow during diffusion. Couture Diffusion- You can easily adjust the intensity to get your perfect ambient perfume. The scent is released intermittently (30 minutes on, 30 minutes off) to avoid over-saturating the atmosphere. After four hours, the diffuser shuts itself off. Individual fragrance cartridges have a 150 hour life cycle and are available in 7 different fragrances. This item is not for sale in Catalina Island