Tripp Lite's 4-port USB KVM Switch is the optimal solution for controlling up to 4 USB computers from one keyboard, mouse, and monitor. It features keyboard and mouse emulation for error-free boot-ups and works on all operating systems. This device also supports 180MHz video resolutions up to 1920 x 1440 pixels without any noticeable degradation. It features a compact design that does not require external power, software, or complicated set-up procedures.