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Iogear 4-port KVM Switch - $20 (Redondo Beach)
Grant near Rindge
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Switches display (15 pin VGA), USB (kbd/mouse), and Audio for up to 4 computers.
Includes switch and 4 cables (2 hardwired to unit, 2 removable).
Like new condition.
Note that it isn't necessarily required to use the video switching (VGA is admittedly dated) for the unit to function. It works perfectly fine as just a keyboard/mouse/audio switcher.