Alternates for lasting freshness. Contains 1 Alternating Scented Oil Warmer and 1 Dual Scented Oil Refill. 1. Soft green lights indicate which scent is working. 2. Adjustable intensity control. 3. Two complementary scents. 4. Plug rotates to fit outlet. Automatically alternates throughout the day so you don't get used to the same scent. Eliminates odors in the air caused by bacteria. Freshness you notice for more than 30 days (on low). For use with Febreze NOTICEables Dual Scented Oil Refill included in package. UL Listed. Made in U.S.A.