EL-N008 Easy go,No power adapter necessary;conveniently powered through USB port. Great ergonomic shape for easy type True plug and play for USB derice like mouse,keyboard,card reader,...etc. Support low noise Fan Size:70x70x25mm Fan Speed:3200+-10% RPM Max Air Flow:20.5CFM Life Expectancy:30,000 hours Rated Voltage:20.3dB(A)