Add additional chassis cooling with a 40mm ball bearing fan This 40mmx 10mm PC computer cooling fan is a perfect addition or replacement PC fan for maintaining suitable operating temperatures within your computer case. The PC fan can be powered through a simple LP4 connection to the PC power supply & offers a dual ball bearing design to ensure quiet, dependable operation. * A dual ball bearing design ensures reliability & longer life * Backed by a Star Tech.com 2-year warranty & free lifetime technical support