The USB port of this 4K HDMI KVM switch is standard USB 2.0 version
Yes,it support hotkey switch,you could set 4 groups of hotkey modes by yourself
Yes,the USB port support USB camera,U Disk,printer,read card,keyboard and mouse
Sorry,it can not,it support the resolution up to 4k@60Hz,4K@30Hz,1080P@60Hz
This 2 port HDMI KVM switch support mirror mode,but not support extend mode.