Review on TESmart DisplayPort + HDMI Dual Monitor KVM Switch: UHD 4K @60Hz, USB 2.0 Control, 2 Computers + 2 Monitors (Red) by Bill Sorenson

I returned mine after 6 hours of fighting with it. First, let me say that I'm a computer scientist and I work with computers for a living. I wanted to use a dual monitor KVM switch because I was tired of manually switching the second monitor's input. I have two very large monitors with a resolution of 3440x1440. This device could not handle both. I tried it on Ubuntu, Windows and Mac OS and each failed to send the full resolution. I had to shrink one of the monitors so it wouldn't go blank. I ended up replacing it with the CKL, which is smaller, cheaper, and more powerful.