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StarTech triple head display port to DVI Multi Monitor Adapter - UWHS | May 2011

The device is quite small and doesn’t weigh much, so it can be tucked away nicely out of the way. The power comes from the USB connector so that means no extra power supply to connect, which is a good thing, as if you are 3 monitors you already have enough power supplies and cables plugged in!

Link to the article