This is the RATOC Systems PC Automatic Switch (for 2 PCs) REX-230XDA. Cross-interface connection, DVI/Audio compatible (for 2 PCs) High-quality DVI only! WUXGA (1920x1200), Full HD compatible switch - Operate 2 PCs with one set of USB mouse, PS/2 keyboard, and DVI monitor. ■ Features (excerpt from the RATOC Systems website) (https://www.ratocsystems.com/products/subpage/230xda.html) ● Operate 2 PCs with one set of consoles ● Wide monitor OK! WUXGA/Full HD compatible ● Compatible with HDCP devices such as terrestrial digital TV! ● Connect PS/2 keyboard and USB mouse ● Speaker compatible ● Supports switching buttons and hotkey switching ● Easy to start multiple PCs with background startup! ● No external power supply required ● Easy connection and easy installation ● Compact design, aluminum body ● Mouse and keyboard only connection is also possible ● No use of 6 harmful substances I have stored this at home for many years after purchase. There are some scratches, but it is a beautiful item with little use. I listed it hoping someone will use it. ◆ Please purchase at the listed price, including shipping. No individual sales. ◆ Standard phrases, "just in case," and selfish discount comments will be deleted or blocked. ◆ I hope this will be used as a reused item if someone needs it. Please refrain from purchasing if you are looking for a new condition or the quality of a store sale, including packaging. ◆ Please be sure to check the shape, condition, and matching in the photos. Returns are not accepted. Please comment if you have any questions. ◆ The description and photos are all that is included. This is a used item, so it is not perfect. Please consider carefully.