Product information: Power Supply: USB Noise Level: Less than 36 dB(A) Motor Type: Brushless Motor Rated Voltage: 5 V Additional Features: Stepless 100-speed adjustment, cooling air blow Number of Fan Blades: 6 or more Rated Power: 6 W Capacity: 4000 mAh Operation Mode: Standard buttons Wind Speed Settings: 5 levels Packing list: Fan*1