The Arrow Ultrasonic Aromatherapy Diffuser, with its detailed metal cover, is an elegant new way to fill your home with the scents you love. The Arrow 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 and recharge you.