1.Brushless,Long life,High efficiency 2.USB pump,brushless USB pump,DC brushless USB pump 3.quiet,more than 20,000 hour's life USB pump,brushless USB pump,DC brushless USB pumpFeature: 1. Life: Expected life span is at least 20000hours. 2. Low noise: 30dB, far from 10cm distance. 3. Duty work: The pump can operate for long time. Continuous operation. 4. Working conditions: Applying to indoor ...