This is a used KVM switch I've had for several years. I'm replacing it with a pure software solution as the hardware is a bit finicky with the a new Windows 11 laptop I use it with - switching back and forth causes the fans to go crazy on my laptop or even the occasional blue screen.
As far as I can tell the unit is working as intended but I've gotten tired of having to reboot my laptop or the KVM switch itself to get everything working again.