Contains 1 Alternating Scented Oil Warmer and 1 Dual Scented Oil Refill (0.879 fl oz/26 ml). Alternates for lasting freshness. 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). Soft green lights indicate which scent is working. Adjustable intensity control. Two complementary scents. Plug rotates to fit outlet. C/UL/US Listed. Refill made in USA. Warmer made in China.