Lamptron FC4 Fan Speed Controller 20W x 4 channel Black Stepless speed knobs control up to 4 cooling fans at up to 20W each Blue LED's brightness intensifies as cooling fan's RPM is adjusted higher 4 x 3-pin connector to fan, 1 x 4-pin molex connector to power supply CNC milled solid aluminium panel of up to 3/4", fits any standard 5.25" drive bay (5-7/8" x 1-5/8") Aluminum front bezel in silver, minimalist design with quality components