PS2 round plug mouse or keyboard can convert to male USB port. Some computers are only equipped with USB interface, but not with PS / 2 round plug. If you want to use PS / 2 keyboard and mouse, you need this adapter cable. Support windows7 / 8/10/98 / 98SE / ME / 2000 / XP and MacOS9.0 / OSX / Linux and are suitable for computers without PS2 interface, plug and play, automatic identification without driver installation. Support hot swap. Only suitable for desktop computers and laptops, it connects mouse and keyboard. Unsupported devices: Scanners, tablet computers, all-in-one computers, KVM switches, cash registers, mobile phones, etc. are not supported. Note that the mouse or keyboard with USB plug cannot be used. PS2 round plug mouse or keyboard can be used. - COST EFFECTIVE. it will allow you to use your old keyboard with your new computer that will only support USB interfacing. Nice way to extend the usefulness of older high-quality and favorite keyboards.The adapter allowed you to use an old keyboard and helps to avoid some unnecessary landfill.Highly recommend it if you want to bring old keyboards back to life. - COMPATIBILITY. It works perfectly even with very old keyboards. it allows you to reuse the old setup with a full PS2 KVM. It works with both Linux and Win. Old keyboards and mice that lay in the cellar can prove useful again. - RECOGNIZED INSTANTLY.It is able to connect the keyboard and mouse to it and plug it all into the usb port that immediately detects the device.Works speed perfectly . Connect a mouse and keyboard to a laptop perfectly well and got recognized as soon as you booted.Works without lag. - A QUALITY ITEM.Have a USB chip in itPlugging it into the kvm cables was easy nice solid fit. The quality of the adapter appears to be well made and sturdy. Blue for keyboard, green for mouse.The build of the device is a lot better than most. It has that block in the middle of the cable.the adapter is rugged enough to last for years and years. - SIMPLE PLUG AND PLAY.Worked straight out of the box. No configuration, installation or settings needed. Just plug in and type away. Perfect.does exactly what I wanted it to do.