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Power mode: USB Noise: 36dB (inclusive) or less Color: beige, starry sky gray Built-in battery capacity: 2000mAh-4000mAh (inclusive) Shell process: 3379565 Product Net Weight: 640 Battery life: 8-12 (inclusive) Motor type: brushless motor Whether to support charging: Yes Packing volume: 261x147x176mm Rated voltage: 5 Additional functions: 5-speed adjustable wind speed, intelligent timing Number of blades: 3 pieces Fan Category: USB Fan Brand: Ai Yimi Part Number: YH-F102 Appearance size: 255x141x170 Rated power: 3 Whether it has a built-in battery: built-in battery Battery capacity: 4000 mAh Operation mode: normal button Working hours: 4-10 hours Shaking method: shaking the head up and down Wind speed gear: 5 gears