Uses the fragranced cover of the dispenser as the air freshener refill itself. Instead of unlocking a dispenser, unloading the old refill, loading the new refill and replacing the cover, you just take off the old cover/refill and replace it with a fresh one. Light sensor technology mean is only runs the fan when the lights are on extending air freshener performance to a full 30 days and battery life to 5-6 months. Eco-friendly refills are 100% recyclable and VOC compliant. Each cover is composed of a unique material containing twice as much fragrance as most other air fresheners which is released over 30 days. Manufactured with over 50% less energy than typical plastic or steel containers. On, Off, and Light Sensing modes.