一．URPOWER 500ml Aromatherapy Essential Oil Diffuser Humidifier with 4 Timer Settings, 7 LED Color Changing Lamps and Waterless Auto Shut-off Sale：$21.99 Current Price:  $18.19 About the product: 3 in 1 FUNCTIONS: Aromatherapy Diffuser, Humidifier, Night Light. PLEASE clean it at least once a week. ADVANCED Ultrasonic Diffusing technology which produces vibrations at a frequency of