Greathtek 4-Port USB 2.0 HDMI KVM Switch Box. Allows up to 4 computers or laptops to share 1 monitor and a single set of keyboard, mouse, and USB peripherals. Supports crisp Ultra HD resolutions up to 4K@60Hz. Features simple front panel push-button switching and LED indicator lights for active PCs. Unit only; does not include external cables or power adapter (powers via connected USB host ports).