Adesso ADP-PU21 - PS/2 to USB Adapter, connects 2 PS/2 connectors to 1 USB port/hub Easy installation, no software driver needed Use Existing PS/2 Input Devices on New USB Computers Connect Two PS/2 Input Devices to One USB (PC) Port Works With All Adesso Touchpad and Trackball Keyboards Compliant with USB 1.0/1.1 Revisions Supports both UHCI and OHCI specifications Converts 2 PS/2 devices (Keyboard & Mouse) to 1 USB port Supports computer USB interface to PS/2 port of KVM Switch Supports Bus-Power meaning no power adapter is needed Easy installation with no software driver required