The ATEN™ CS18216 16-Port USB 3.0 4K HDMI KVM Switch can effectively access and control up to 16 HDMI computers from a single USB keyboard, USB mouse, and HDMI monitor console. The CS18216 supports high video quality up to 4K DCI (4096 x 2160 @ 60Hz), presenting crystal-clear visuals. Multi-Display feature – stacks up to eight CS18216 units and display video from up to 8 monitors (dual display / triple display / quad display / multi-display). Video DynaSync™ – an exclusive ATEN technology that eliminates boot-up display problems and optimizes the resolution when switching among different sources.