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 0-100%, the knob rotates clockwise to increase speed, counterclockwise to reduce speed, and counterclockwise to turn off., Manufacturer: Akfldms