The quiet fan kit is intended for light cooling and ventilation applications that require minimal noise. Contains two ultra low speed 80mm fan running at 2000 RPM. With long life dual ball bearings, the unit can be mounted in any direction. Features a stainless aluminum frame with a beautiful brushed finish and matching countersunk screws to give your cabinet a clean and professional look. Mountable onto panels up to 1.25-Inch thick. Includes a 6 foot cord with an on/off switch that can power the unit through a standard wall outlet or USB port, a plug adapter is included. Each unit contains an additional USB port, up to four fans can be daisy chained together to share the same power source (dual units count as two fans). Fans are certified by CE, UL, TUV, and RoHS. This cooling system is popular in a variety of applications including AV, DVR, media, and home theater cabinets; and smaller enclosures such as computers, stereos, and amplifiers.