A KVM switch (Keyboard-Video-Mouse) is a major boon to anyone who has to work with more than one computer. You can change computers without having to give up the keyboard and monitor you're already using, sometimes via the keyboard itself. Imagine the space and money you'll save, only having to buy one monitor, keyboard, and mouse. After saying that, KVM switches stop being exciting pretty quickly, so let's look at things to shop for. Will it switch your speakers, too? How about your microphone? Is it USB only, or can it handle older connections? Hardware button, keyboard command control, or both? Does it draw its power from the computer, or does it need a power adapter? How many computers do you need to switch? (Most KVM switches will handle two computers; some can handle more.) The LINKSKEY LKU-S04ASK is a 4-port compact USB KVM Switch with Audio and Mic switching function allowing you to manage four PCs with just one set of keyboard, monitor and mouse. A Win-based switching software is included for Type: D-Sub, USB Computer Connections: 4 Ports Monitor Connections: 1 Port Video Resolution: 2048 x 1536 PC Selection: Push button / Hotkeys / Switching Software PC Connectors: 4 x HDB 15-pin (For PC Video) 8 x 3.5mm Audio/Mic Jack (For PC Sound) (All Female Type) Console Connectors: 1 x HDB 15-pin (For Monitor) 2 x USB Type A (For Keyboard & Mouse) 2 x 3.5mm Jack (For Speakers and Microphone) (All Female Type) Dimensions: 6.4" x 2.8" x 1.1"