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 adapter cables. You can turn the fan on or off using the USB port. Connector: One end is a USB port, the other end is a small 3-pin or 4-pin connector for case fan power adapter cable. The fan must operate at or below 5V (12V fans will not work properly). 12V fans can be operated at reduced 5V for quieter performance. This cable allows you to supply power to a chassis fan from a computer's USB port, or use it 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: OD3.5mm Rated temperature: 80C Function: Converts chassis or CPU fan power to USB supply Note: The fan must have a rated voltage of 5V or less (fans with higher voltage will not work). When using this USB adapter cable with a chassis fan, fan speed may be reduced by approximately 60%. It is recommended to use a fan designed for low-speed operation when using this adapter. 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 variation between the item in the picture and the actual product. Measurement may vary by +/- 1-3cm.