The Window Ultrasonic Aroma Diffuser fills your space with the scents you love. The detailed porcelain cover adds a stylish touch to any room. The Window 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 be fixed to one color. To use, add water and the essential oil of your choice, turn it on, and let the cool mist restore you.