Features: High-quality cable with a 5V USB port to small 3-pin / 4-pin fan connector, including an on/off switch for convenient control. This cable allows you to power most case fans via a USB connection and is compatible with both 3-pin and 4-pin case fans. Easily turn the fan on or off using the integrated switch. Connectors: One end features a standard USB plug, while the other end has a small 3-pin / 4-pin fan connector. Cable length: approximately 40cm / 15.75 inches. Note: The fan must have a start voltage at or below 5V (fans with a higher start voltage will not operate). 12V fans will run at 5V, resulting in quieter performance. This cable is ideal for powering chassis fans from a computer's USB port or for DIY modifications such as notebook cooling pad fans. Package Includes: 1 x Cable Specifications: Name: USB to 4-Pin Fan Cable – 1 to 2 Way Length: approx. 40cm / 15.75in Wire model: 2464 Wire gauge: 22AWG Insulation material: PVC Conductor specification: 17x0.14TS Conductor material: Pure copper Wire outer diameter: 3.5mm Rated temperature: 80°C Color: Black Interface: 4-pin fan connector on one end, USB interface on the other Function: Converts chassis or CPU fan to USB-powered operation Note: The fan must have a start voltage of 5V or lower (fans requiring higher start voltage will not work). When using this USB adapter, fan speed will be reduced by approximately 60%. It is recommended to use a higher-speed fan for optimal results. Please allow 0–1cm variation due to manual measurement. Due to differences in monitor displays, the actual product color may vary slightly from images shown.