Powerful enough to freshen larger areas The cover contains 2-3 times more fragrance than gels or metered aerosols. The motor driven fan moves air freshener further than a typical passive system, so you'll freshen larger areas. Freshens consistently for 30 days The smart chip controlled fan freshens consistently since it turns sparingly in week 1, and gradually turns more frequently until week 4 when it runs constantly. Easy to use Maintenance is simple with easy to use LED and audible reminders along with a push button cover for quick removal and replacement. Safe for the environment Cannot spill or misfire, part of the industry's first closed-loop recycling program so it's easily recyclable.