Logitech 830680-0000 Infra-red Receiver for Cordless Mouse/KYB C-BG17-DUAL 4.B4.    USB and PS2 connections to computer.  This adapter is for connecting your older Logitech wireless keyboard & mouse to a computer’s PS/2 or USB ports. P/N: 830680-0000. M/N: C-BG17-DUAL. It is in good used condition. Please check with Logitech for compatibility with your keyboard & mouse BEFORE you purchase this item.