The new Twilight Ultrasonic Aromatherapy Diffuser, with its detailed grey glass cover, designed by Cozzolino Studios, is an elegant new way to fill your home with the scents you love. The Twilight diffuser runs up to 4-hour continuously or up to 8-hour intermittently and has a timer for 60, 90, or 120 minutes as well Simply add water and your favorite essential oil, then turn it on to let its gentle mist and 7 rotating LED lights relax and recharge you.