Review on TESmart HDMI 4K60Hz Ultra HD 2X1 HDMI KVM Switch 3840X2160 @ 60Hz 2 USB 2 by Jesse Hughes

Definitely 4K switched to 60Hz; verified by Windows 10 display settings. This is one of the few KVMs on Windows that switches video at this quality. Keyboard and mouse emulators are VERY basic, so you lose special keyboard key functions (volume, playback controls, etc.) and all fancy mouse buttons. The mouse is also very slow; So late that I'm now using separate mice (mice?) connected directly to two computers on this KVM. If you're willing to put up with emulator issues, this is a great value. If not, look elsewhere.