Designed for 5V 4-wire PWM fans. The input end is a TYPE-C female port, compatible with TYPE-C port chargers, and any USB port can be used as a power supply device, such as a charger/power bank/PC/notebook/router, etc. The output end is a small 4Pin socket. Built-in PWM signal generation circuit. The fan speed adjustment range is 0- , the knob rotates clockwise to increase speed, counterclockwise to reduce speed, and counterclockwise to turn off. Parameters: Product name: PWM speed regulator (5V special version) Input voltage: USB -5V Output voltage: 5V PWM frequency: about 25KHz Output current: determined by the USB power supply device Input port: USB TYPE-C female port Output port: PWM 4Pin (KF2510) Speed regulation range: PWM duty cycle 0- Colour:Black Material:plastic type: 1 to 3 Adapter cable Package Contents: 1 x PWM Speed Controller 1 x USB to TYPE-C power supply cable 1 x Adapter cable