Features: Brand Function: This cable features a 5V USB port to small 3-pin or 4-pin fan connector with an on/off switch, allowing you to power most case fans via a USB connection. Supports both 3-pin and 4-pin case fan connectors. You can turn the fan on or off at any time using the switch. Connector: One end is a USB plug, the other end is a small 3-pin or 4-pin connector for case fans. Cable length: approximately 40cm / 15.75 inches. The fan must have a starting voltage of 5V or lower (fans requiring higher start voltage will not operate). 12V fans can be used but will run at reduced speed and lower noise due to 5V operation. This cable allows you to power chassis fans from a computer's USB port or use it for DIY projects such as modifying notebook cooling pad fans. Specifications: Name: USB to 4-Pin Fan Cable with Switch, 1 to 2 Way Length: approx. 40cm / 15.75in Wire model: 2464 22AWG Insulation material: PVC Conductor specification: 17x0.14TS Conductor material: Pure copper Wire outer diameter: 3.5mm Rated temperature: 80°C Color: Black Interface: USB connector on one end, 4-pin fan connector on the other end Function: Converts case or CPU fan power to USB for convenient power supply Note: The fan must have a start voltage of 5V or less (fans with higher start voltage will not work). When using this USB adapter cable, fan speed will be reduced by approximately 60%. It is recommended to use a higher-speed fan for optimal performance when using this adapter. Allow 0-1cm variation due to manual measurement. Please ensure accuracy requirements before ordering. Due to differences in monitor displays, the actual product color may vary slightly from images shown. Package includes: 1 x Cable