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Product Details Power Source: 18650-3.7V 2000mAh Battery Type: Air Cooling Fan Installation: Neckband, Portable Material: Plastic, Plastic Charge Time: 2~3 Hours. Features: 1. Mute motor super strong wind 2. Wear load and comfortable hands free 3. Fan angle adjusted 4. product lightweight cool and fashionable 5. three wind speed a key switch How to use: First, you'd better charge before use it at the first time. Second, hanging around your neck and long press button to on/off Finally, press button repeatedly to change the wind speed Low/Medium/High