StarTech.com 4 Port HDMI KVM Switch - 4K 30Hz - Dual Display - This 4 port 4K HDMI KVM with dual monitor support lets you control four HDMI computers with a single
Rybozen HDMI KVM Switch 2 Port Dual Monitor Extended Display, 4K USB KVM Switch HDMI with Audio Microphone Output and USB 2.0 Hub, PC Monitor Keyboard Mouse Switcher KVM Switches - Newegg.com
Amazon.com: HDMI KVM Switch 4 Port Dual Monitor Extended Display, CKL USB KVM Switch HDMI 4 in 2 Out with Audio Microphone Output and USB 2.0 Hub, PC Monitor Keyboard Mouse Switcher
Amazon.com: 2 Port Dual Monitor KVM Switch HDMI 4K@30Hz, 2 USB 2.0 Hub, Supported Wireless Keyboard & Mouse and Hotkey Switch, No Power Adapter with 4 HDMI Cables : Electronics