This ultrasonic diffuser is a classic, elegant addition to any space with a strong, 3-hour continuous mist and a beautiful, gradient lighting effect. Simply add several drops of your choice of Dejaci Home Fragrance to the water for an instant aromatic environment. The PureMist further supports your sensory experience with its color-changing lights. – Water Capacity: 130 m – L (4.4 fl oz) Coverage Area: Up to 300 sq ft – Continuous Operation: Up to 3 hours  – Light Modes: Rotating or freeze color – Automatic safety shut-off.