The best-selling Astro White 90 Ultrasonic Aroma Diffuser fills your space with the scents you love. The sculpted frosted glass cover will add a modern touch to any room. The Astro Diffuser runs up to 4-hours continuously or up to 8-hours intermittently. Customize your relaxation with the 60, 90, 120-minute timer and 7 LED lights. The 7 LED lights can rotate or be fixed to one color. To use, add water and the essential oil of your choice, turn it on, and let the cool mist relax and recharge you.