QUALIWORTH Aroma Essential Oil Diffuser With Auto Shut-Off When Water Runs Out For Safety, Ultrasonic Vapor Technology Humidifier, 7 Color Light Changing, 300ml capacity. Continuous Mist, 1HR/3HR/6HR Pattern, Lights Only and Mist Only Natural Dark wood plastic design that blends with home furnishings and decorations. Auto shut-off when water runs out for safety to avoid damage and operates up to 10 hours on a full tank of water LED mood lighting with separate on/off control New and improved Ultrasonic Vapor Technology - No heat or flame.