It's with brushless motor,can continuous run 20,000 hours under 70 degrees.Features:Low noise,long life,energy-saving. 1. 4" Mini USB Fan

2. 4 aluminum blades with brushless motor

3. Power coating or chrome plating grill guard

4. No timer & automatic tilting

5. Practicability and fashionable use when working.

6. Durable & safe usage.

7. Competitive price with high quality performance

8. 1.5m wire visible length with USB plug

9. Voltage: DC~5V

4" Mini USB Fan