Function: 1 Applicable Scope: The motherboard has a USB 3.0 interface, the chassis does not have a front USB 3.0 interface. USB 3.0 19pin adapter to dual 9pin adapter to switch to USB 2.0 interface on front 2. Black PCB: PCB of motherboard USB 3.0 19pin header adapter is black, interface speed is 480Mbps, working environment is -20~75℃3. WIDE COMPATIBILITY: USB 3.0 19pin female header adapter supports WIN XP, WIN 7, WIN 8, WIN 10, LINUX, OSX 4. USE WITH CONFIDENCE: The USB 3.0 19pin adapter to dual 9pin adapter will help you get the most out of your dual 9pin motherboard resources 5. Easy to use: USB 3.0 19 pin header adapter is easy to use, compact and easy to carry without drivers. How to use: USB 3.0 is 2 rows of total 20 PIN, one of them is pulled out to prevent fool, also known as 19PIN. Please do not shake the end of the USB 3.019PIN to the motherboard and do not shake it side when pulled out. Do not pull out the plastic shell and pins in the socket. Remember! If you pull it out, you can fix it by yourself. This is just an adapter board that connects the USB 2.0 signal of the main board directly to the pin. Test speed depends on the device used and the main control board, and &. a>