Kingwin FPX-001 Fan Controller 4 Channel w/ LED. Controls up to 4 Sets of PC Computer Fans, Independent Turn Knob Control, and Fits 3.5 Inch Drive Bay. Easy Setup, and Easy Control of Your Cooling Fans Model: FPX-001 LED Indicator for Power On/Off Control 4 Sets of Fans Fit 3.5-Inch Bay 3 Pin Fan Connections