Advantages 1. Three-speed stable wind, wind speed up to 6/s, 14000 rpm2. Reverse charging function, can be used as a cellular strength bank3. Outdoor lighting4. Neck/Waist/Handheld/Desktop5. 4000mAh ultra-long battery life6. Waterproof, drop-proof, sweat-proof, dust-proof Scenario: running, hiking, mountaineering, camping, outside work, etc.