Deepcool Rockman 3.5 inch Bay Fan Controller with PWM , thats nice that is has pwm but only one pwm channel , simplly for cpu fans other two are 3-pin connector & total output is below 30watt,4th knob dosn't do anything except controlling those silly annoying lights on the other knobs. It says its sound reactive led controller, but its not only the front bay led's are sound reactive.Build quality: Very flimsy , the top is metal but bends often, base is plastic , the pcb circut is really ********** all the components are seems that they some how made it.Verdict: If u want to lower down any fan to 0 u cant do it with this its min vol is 6.5v & max vol is 11.5v.Last Words:@t this price point build quality is not good, more over its 3.5inch , think before buying................cheers to all