Features:1. Double-leaf silent circulation fan: Reverse fan blade design quietly circulates airflow: unique dual mirror motor design. The air duct curve is fully optimized, and the rear five blades rotate at a high speed, and the surrounding airflow is extracted to send the wind forward. The front seven blades are sent out to the soft natural wind, and the wind is large and quiet.2. Gold-plated carbon brush motor: up to 2000 hours of service life. Using a dual motor, the blades of different orientations are combined at an optimal angle to drive the two opposite blades simultaneously.Interface: USB computer interface, socket interface, mobile powerPower: DC5V (fixed) 500mA or more USB portAirflow intensity (M or MIN): strong 6.5 weak 5Noise (decibel): 2634USB cable length: 1000mm or 39.37notes:1. There may be slight size deviations due to manual measurement, different measuring methods and tools.2. The picture may not reflect the actual color of the item because of different photographing light, angle and display monitor.3. The wind speed is the value measured in accordance with JISC9601 at a position of 50 cm.4. Noise is the value measured in the soundless room. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.