1Pc Mini USB Donut Humidifier Air Purifier Aroma Diffuser Home Office Car Portable New Fashion Specifications: Power by: USB Charging Cable. Power Input: DC 5V/500mA. Rated Power: 0-2W Material:ABS plastic+TPE cable. Size: internal diameter: 1.6cm/0.63\" external diameter: 5cm/1.97 Color:White Package includes: 1 x Humidifier (other accessories demo in the picture is not included.)