Fangrui Product Details Pwm Speed Controller Designed For 12v 4-wire Pwm Fan/pump. This Pwm Speed Controller Support 12v Standard Fan Speed Control, Also Support Computer Water Cooling Pwm Pump Head Speed Adjustment. This Governor Is Recommended To Control The Output Power Within 7-8 Watts (12v 0.6a). This Governor Input Port Is Usb Type-c Female.output Is Standard Pwm 4pin Fan Port. Built-in Dcdc Boost Circuit(boost Usb 5v To 12v).built-in Pwm Signal Generator (make It Able To Adjust Speed). Fan Speed Adjustment Range 0-. Turn The Knob Clockwise To Increase The Speed, Turn The Knob Counterclockwise To Reduce The Speed. The Application Scenario Of The Governor Design Is Mainly Powered By The Charging Head/rechargeable Battery, The Common Output Capacity Is Generally 5v/2a, Higher Specifications Are Relatively Rare, And The Parameters Of 12v/0.7a Fan Almost Reach 5v/2a Full Power Supply, While Taking Into Account The Small Size Of The Pwm Governor So Limited Cooling Capacity. It Is Recommended That The Output Current Be Cont