Note: There are two strength strategies for this product: USB plug in and battery charging Power mode: USB, Battery capacity: 1200-2000mAh Noise: above 70dbRated voltage: 5VRated power: 8WWind speed gear: 1/3 gearOperation mode: mechanicalPackage volume: 21: whitBlack, greenFan blade diameter: 145mmCharacteristics:7-color LED lighting for followers and humidifiersLeather manage design with adjustable fan up and downRemovable water tank design,Simply join the USB cable to a device that helps USB ports, great quiet and energy-efficient Model A: Model B - Battery: