This 2 way Fan Speed Controller for PC allows user to control PC CPU Fan at floppy drive bay. There are 2 speed knobs to adjust the double fan speed. Features: 2 Way control Stop Working Alarm Control Voltage Adjustable Range: 5-12V Channel Support up to 8W Adjust from full speed to low speed Suitable for high RPM fan Install on standard floppy drive bay Approx Size : 101 x 102 x 25mm Package Content : 1 X Floppy 2 Channel CPU Fan Speed Controller PCW TB35-2FC (Note : Photo attached is for reference only, it may be slightly varied in items of colour, shape from the actual item delivered from time to time)