PWM duty cycle (0-100%) The input terminal is TYPE-C female port Designed specifically for 12V 4-wire PWM fans/water pumps The output end is a small 4Pin socket Built-in PWM signal generation circuit Integrated solution, integrated power supply + speed regulation Operation method: Turn the knob clockwise to increase speed, counterclockwise to decrease speed, and turn the knob fully counterclockwise to close. Product name: PWM speed regulator Output voltage: 12V PWM frequency: about 25KHz Input port: USB TYPE-C female port Output port: PWM 4Pin Speed adjustment range: PWM duty cycle 0-100% Colour:Black Material:ABS Package Contents: 1 * PWM Speed Regulator Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.