All the cables and power supply needed to get started were included with this item. Misplaced some cables, plugged in some new cables, threw away three keyboards and three mice and everything was up and running. The USB inputs are on the side of the box if not on the back. This doesn't change the fact that this is a great achievement, just individual preference when I plugged it in and used it. This is a definite buy if you want a 4-port HDMI KVM switch.
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