IEI / VWBOX-E122 / 1 x DVI Input, 4 x DVI Output, 2 by 2 display (2 x 2 Video Wall Controller)

I found this device in youtube website after i watch the review about it iam search about it in amazon.com then i found new and used i see the price for used one it's good for me i buy it and then i received it's wonderful every think ,,,, good luck