Aromatherapy Ultra-Sonic Nebulizer: To create an all natural spa-like sanctuary, just add water and a few drops of our therapeutic essential oils or synergistic blends. Turn on the power and select from five different time and output settings. The unit is digitally controlled to power off whenever the water level is low. Safe to use - no heat or glass. Easy to clean - tube free - clog free! ON/OFF switch for LED lights. Operates for 5 hours. Diffuses up to 300 square feet. External dimensions: 4 1/2" high x 6" wide x 7" deep. Power adapter and extra dispersal nozzle included.