Included: User's manual ● Operate 4 PCs with one set of keyboard, monitor, and mouse By using REX-420XA, you can switch between 4 PCs and operate them with one console (keyboard, monitor, and mouse). ● Cross-interface that allows simultaneous use of keyboard and USB mouse ● Supports switching via switching button and hotkey ● Audio support ● High resolution up to 2048 x 1536 possible ● No need to install dedicated drivers There are no noticeable scratches, but there are some minor scratches and dirt due to aging. Please refrain from purchasing if you are looking for perfection or are sensitive to such things. Everything in the photos is included. Operation has been confirmed, but it has not been used for extended periods. Please be aware of this beforehand. ------------------------------------ [Shipping Method] ※ This product will be shipped via [Yu-Yu Mercari Bin - Anonymous Delivery]. [Notes] ・ Sold as is. Please judge the product and its condition based on the images. ・ Basically, no claims, no returns, and no cancellations are accepted. I will do my best to respond quickly and politely, so thank you for your cooperation.