One end is 4 pin chassis fan header,and another end is the computer USB port
Chassis fan must support low-voltage 5V to start because USB voltage is 5V.
The cable can convert USB 5V into 12V for computer PC fan use

Note: When using the chassis fan with USB interface as power supply, the fan speed maybe be reduced to more than half the original speed.
Specification:

Color: Black
Material: Plastic
Cable Length:11.8"/ 30cm

Package Included:

1pcs USB To 4 Pin Molex Cooling Fan Connector Cable