Connector A: Motherboard Internal Header USB 2.0 9Pin Male Connector B: Motherboard Internal Header USB 2.0 9Pin Male x2 with 9Pin Female to Female Extension Cable 30cm This item splits the USB2.0 Header 9 Pin from 1 to 2, for cooling, lighting or other system that requires additional USB space. NOTE: Internal USB2.0 Header is a 10Pin header using the standard IDC pin numbering, and one pin has pulled out to prevent dullness, so it's also called 9Pin.