Product details in english
40mm Motor cooling Fan features 7 short blades with a larger brushless motor coil, Which allows higher torque to push the blade to the very high speed range of 14,000-15,000 RPM => 8.4V. For greater ease of use an extension cable is included in the package.
Size => 40mm x 40mm x 10mm
Weight => 14g
Operating Voltage => 6V-8.4V
RPM => 8.4V :14,000 ~15,000
Mere info på engelsk