PWM Speed Controller designed for 12V 4-wire PWM fan or pump. This controller supports 12V standard fan speed control and is compatible with computer water cooling PWM pump head speed adjustment. Recommended to control output power within 7-8 watts (12V 0.6A). Input port is USB Type-C female; output is standard PWM 4-pin fan port. Built-in DC-DC boost circuit (boosts USB 5V to 12V). Built-in PWM signal generator for adjustable speed control. Fan speed adjustment range: 0-100%. Turn the knob clockwise to increase speed; turn counterclockwise to reduce speed. Designed for use with charging adapters or rechargeable batteries, typically with 5V/2A output. The 12V/0.7A fan load approaches the maximum capacity of a 5V/2A power source. Consideration has been given to the compact size and limited heat dissipation capability of the PWM controller. Recommended output current: below 0.7A for short-term use and below 0.5A for long-term operation. This refers to current at maximum speed; fan current varies proportionally with speed setting. Input voltage: 5V Output voltage: 12V PWM frequency: approximately 25kHz Output current: rated 0.5A, maximum 0.7A Input port: USB Type-C female Output: PWM 4-pin Speed range: PWM duty cycle 0-100% Color: Black Material: Plastic Package Contents: 1 x PWM Speed Controller 1 x USB to Type-C power supply cable Only the above items are included; other products are not included. Note: Lighting and display differences may cause slight variations in color between the image and the actual item. Measurement allows an error of +/- 1-3 cm.