Review on 🖥️ CKL Triple Monitor DisplayPort KVM Switch 2 Port 4K 60Hz 4:4:4, 2x3 DP KVM Switch with Audio, USB 2.0 HUBs (Model: CKL-623DP) by Pavan Cormier

I upgraded my monitors to 4K and bought this switch to work with it. It has been found that only flashing or black screens appear when the resolution is set to 60Hz. I've tried multiple cables in different configurations with no success. I ran cables straight from the PC to the monitors and 60Hz works fine. After contacting Revain, their response was to simply issue a return and refund rather than replacing the switch as they believe all of these devices may have the same issue. I told them they need to update the specs page because it is false advertising. Their response was that they were "working" on it. Be aware that this switch (at least the one they sent me) cannot handle 4K at 60Hz. If you're happy with 30Hz, then you're probably fine. But for what I paid for the switch, graphics card, and monitors, I expect it to perform as advertised.