Dimensions40x40x10mm(That is, 4010) BearingsMagnetic levitation motor Working voltage 4.5V - 13.8V ElectricStream 0.15A 1.8W TransferSpeed 8500rpm WindVolume 9.5CFM NoiseAudio 32dba Frame materialsGlass fiber reinforced plastics, PBTShell, PABlade, Environmental certification SpecialPointBecause a special good bearing, have have the same speed of air flow, velocity. Is the first magnetic levitation motor with double ball bearing fan!