This switch works, but . the user must press a key multiple times to switch to the desired device, and . the switch has a nasty habit of skipping one or more ports when a button is pressed (thus skipping the desired one), and . as you may have to go through 3 USB ports to get to the one you want - this can be confusing for PCs or auxiliary devices. I think it would be a better switch if you could just press one of the 4 buttons and thus select the USB port you want, rather than going through all the ports one by one to get to the right one. But like I said, it works.
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