Kama Stay is a very flexible product for mounting additional fans into an unused PCI Slot. The set also includes a manually regulated 120 mm Slip Stream Slim fan. Even 140 mm fans can be used with this new accessory. Optionally, you can also mount up to three 2.5” HDDs or SSDs. Supplied 120 mm Slip Stream Slim fan works in an operating-speed range of 800 to 2,000 rpm. The fan speed can be controlled by using the pre-attached potentiometer located in the PCI bracket.