SpaRoom's Onyx Black Marble Essential Oil Ultrasonic Diffuser features a sleek and modern shape and is available in 2 colors. The diffuser includes an automatic safety shut off for peace of mind and will provide continuous mist for up to 8 hours and intermittent misting up to 16 hours at 15 second intervals. The ultrasonic diffuser is perfect for large sized rooms up to 400 sq. ft. and has a water tank capacity of 200 ml and features multiple light modes. Simply add a few drops (3-5) of our 100% pure essential oils for easy setup with the included Ac Adaptor to enjoy instant therapeutic benefits and a wonderful, natural aroma through your space.