PS/2 to USB adapter is a hot-plug adapter that connects a PS/2 keyboard or mouse to a USB port on a computer, The interface conforms to the USB1.1 full-speed standard, and supports keyboard and mouse interface output,two PS/2 ports are connected from one USB plug (purple for keyboard, green for mouse), There is no need to install driver, plug and play,which also is a good companion for test machine or notebook external mouse and keyboard,