ITEM NAME:USB to Molex 4 Pin PC Computer Cooling Fan 1 Feet Connector Cable Adapter Cord & Features: 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. 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 Weight: Approx 12g Cable Length:11.8"/ 30cm Package included: 1 X USB to Molex 4 Pin Fan Cable.1 X USB to Molex 4 Pin Fan Cable. One end is 4 pin chassis fan header,and another end is the computer USB port. Cable Length:11.8"/ 30cm. Weight: Approx 12g.