1. Material: aviation aluminum alloy + environmentally friendly silicone + ABS 2. Input voltage: 5V-1A 3. Power: 1W-3.5W 4. Cooling: blower cooling 5. Widely compatible with notebooks and tablets under 15.9 inches 6. Portable storage, easy to carry around. 7. Silicone protection, anti-scratch does not hurt the machine. 8. Hard core structure, alloy skeleton bearing load. 9. One key switch, light/fan mode. 10. No headache after blowing for a long time, as comfortable as natural wind. 11. Strong wind and low noise. 12. USB interface, compatible and powerful.