The Nexus Ultrasonic Aroma Diffuser adds a modern touch to your space while filling your room with the scents you love. The Nexus Diffuser runs up to 4-hours continuously or up to 8-hours 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 refresh you.