The fan runs smoothly and the operating sound is relatively quiet compared to high-speed fans of the same type. The transparent turbine casing of the fan is beautifully crafted, with a strong magnetic inner rotor 39mm brushless motor, front and rear NMB ball bearings, and aluminum alloy casing brushless motor with heat dissipation slots. High end strong magnetic inner rotor brushless motor and high-speed turbine fan in stock, all fans come with packaging with bubble bags, visually indicating that they are new unused fans. This fan does not come with a brushless drive and needs to be equipped with its own brushless drive to operate. It can also be driven to operate using brushless electric adjustment., Manufacturer: Akfldms