Lamptron FC3 Fan Speed Controller 30W x 4 channel Black Stepless Speed Control of 4 cooling fans up to 30W per each fan (cooling fan with 3-pin connector), blue LED brightness increases as fan speed climbs 4 x 3-pin connector to fan, 1 x 4-pin molex connector to power supply Fits any standard 5.25" drive bay (5-7/8" x 1-5/8"), easy installation Available in black anodized aluminium or aluminum silver, CNC milled solid aluminium panel of up to 3/4"