Working Voltage: DC 5V;
Size: 40*40*10mm / 1.57*1.57*0.39in
Oil bearing: About can run 30000 hours.
Bearing is high precision, long life and low noise.
Bearing: Oil Bearings
Speed: 4200±10%RPM
Working Current: 0.21A
Noise Level: 22 dBA
Number of fan blades = 9