Sharing one device between two computers ・Main unit ・USB cable --------------------- This is a USB 2.0 switch that allows you to share four USB devices between two computers. You can easily switch and use various USB devices such as a mouse, keyboard, printer, and external HDD. Switching can be done smoothly with the push of a button. I couldn't find much helpful information, so please refer to Amazon. https://www.amazon.co.jp/PWAY-USB%E3%82%B9%E3%82%A4%E3%83%83%E3%83%81/dp/B0CRF2K2TJ