Spread the soothing, aromatic benefits of essential oils throughout your home while adding moisture to the air with this essential oil diffuser & humidifier. Working best with essential oils, it creates a fine mist to fill a 215-322 square-foot area with aroma-therapeutic properties. Ultrasonic diffusion also imparts moisture to the air; simply add water and a few drops of essential oils to the diffuser humidifier and set. Its background light offers seven color choices (red, blue, green, pink, yellow, aqua, turquoise) or option of color-changing mode. Electric oil diffuser features auto/off function when water level runs low. Includes two operation modes (first mode: continuous operation; second mode: 5-minute, 30-second operation, 30-second stop). Working time: up to 18 hours. Includes UL-listed adapter. Plastic. 5 1/3" high x 6 1/3" dia.