Description: This is the new NHX 30mm Cyclone Turbo 540/ 550 Size Brushed / Brushless Fan with motor Heat Sink. This Fan spins at 28000 RPM which will keep your motor cool all the way till your battery runs out. In addition to that, casing around is fully Aluminum with built in heat sink on both sides of the case for extra cooling. Specification: Mounting Holes: 30 x 30mm Bearing: Dual Ball Bearing Max Voltage: 8.4V Power: 1.40W Fan Max Speed: 28000 RPM Current: 0.28A Wire Length: 100mm Connector: JST Include: 1x Cyclone Cooling Fan with Motor Heat Sink