Function: This cable features a 5V USB port to small 3-pin or 4-pin fan connector, allowing you to power most case fans via a USB connection. Supports both 3-pin and 4-pin case fan power adapters. You can turn the fan on or off at any time. Connector: One end is a USB port, the other end is a small 3-pin or 4-pin connector for case fan power adapter. The fan must operate at or below 5V (fans rated above 5V will not work). 12V fans can be used but will run at reduced speed and lower noise due to 5V operation. You can use this cable to power a chassis fan from a computer's USB port, or for DIY projects such as modifying a notebook cooling pad fan. Name: 2 Way USB to 4-Pin Cable Wire Model: 2464 22AWG Conductor Specification: 17x0.14TS Wire Outer Diameter: OD 3.5mm Rated Temperature: 80°C Function: Converts chassis or CPU fan power supply to USB power Note: - The fan must be rated at or below 5V (fans above 5V will not work). - When using this USB adapter cable, the fan speed will be reduced by approximately 60%. - It is recommended to use a higher speed fan when using this adapter to compensate for the reduced voltage. Color: Black Material: PVC Package Contents: 1 x USB to 4-Pin Adapter Converter Cable Note: Light reflection and different display settings may cause slight color variations between the image and the actual item. Measurement may vary by +/- 1-3 cm.