Features: Increase your computer's cooling efficiency with the Full Speed USB to 4-pin fan adapter cable, featuring a voltage module that boosts the USB 5V power to your fan requiring 12V. PVC insulation, ensuring power conversion and a stable connection compatible with your computer fans. Compatible with enthusiasts and DIYers who want to power their PC case fans via a USB port or convert their desktop fans into a portable laptop cooling solution. NOTE: The difference between the Boost model and the regular model is: The Boost model has a USB port compatible with providing 5V voltage through the Boost module to a computer fan compatible with using 12V voltage. Compatible with: Does not affect fan speed and light brightness! [Regular model is a USB port compatible with providing 5V voltage directly compatible with using the computer's 12V fan] Disadvantages: The 12V computer fan speed decreases, the light brightness becomes weaker or does not light up. Reason: Because the computer fan has 12V voltage, the USB port only provides 5V voltage, the voltage is low, so the fan speed decreases, the light brightness becomes weaker or does not light up directly, and it does not light up because the light's voltage does not support 5V. Because the light's voltage does not support 5V. Specifications: Product Name: USB Adapter Cable Product Length: about 415mm/16.34in Insulation Material: PVC Insulation Wire Outer Diameter: OD3.5mm Compatible with: Individual self-sealing bags Product Role: CPU fan to USB port Power Compatible with: Boost model/Regular model Optional Cable Type: 4-pin/Large 4-pin to USB cable Optional Note: Please allow 1-3mm error due to manual measurement. Make sure you don't mind this before bidding. The color may vary due to the difference in display, please compatible with this. Package includes: 1 pc 4-pin/large 4-pin to USB cable (optional).