Many people do not realize that USB can only cleanly carry a signal up to 16 feet. So if you try to use multiple passive USB Extension Cables, you will notice significant data speed loss. That’s provided your computer can still even see your USB peripheral. This is a situation where you really need an active USB Extender cable. These carry built-in boosters (using USB’s native 5V power) that give you a clean, crisp signal 16 feet from the source. What’s more is that you can actually daisy-chain these for up to 80 feet of USB coverage for your USB devices. So whenever you need to use a USB-controlled device, such as an external hard drive, mouse or keyboard, or phone/PDA, remember to have the right equipment if you need to get some distance from your PC.