Lamptron FC2 Fan Speed Controller 45W x 6 Channel Black Stepless Speed Control of 6 cooling fans up to 45W per each fan (cooling fan with 3-pin connector) CNC milled solid aluminium panel of up to 3/4" Fits any standard 5.25" drive bay (5-7/8" x 1-5/8") 6 x 3-pin connector to fan, 1 x 4-pin molex connector to power supply Blue LED brightness intensifies as cooling fan's RPM climbs