Review on DVI KVM Switch Dual Monitor: 4K 30Hz Bi-Directional Splitter Selector Box for PC Laptop Monitor LCD HDTV by Robert Blair

I received this item which didn't work at all although the light on the switch seemed to work so I returned it and they sent me a second unit. The second device did not have a Displayport cable to connect the device to the monitor, even though the first device did. Unfortunately the second device didn't work well as the screen went black every 30 seconds or so and came back after 10-30 seconds: This happened with different displayport cables and two different monitors. So unreliable and back for a refund. I gave 2 stars rather than 1 star due to the speedy execution and shipping, but it's a shame that the second device in a very simple and straightforward setup (Dell computers with high quality DisplayPort cables) was unreliable.