The Twilight Ultrasonic Aroma Diffuser, designed by Cozzolino Studios, fills your home with the scents you love. The grey glass cover will add style to any room in your home. The Twilight Diffuser runs up to 4-hour continuously or up to 8-hour intermittently. Customize your experience with the 60, 90, 120-minute timer and 7 LED lights. The 7 LED lights can rotate or fixed one color. To use, add water and the essential oil of your choice, turn it on, and let the cool mist refresh your day.