The USB Active Extension Cable ensures the signal quality of your USB cable and it ensures that the signal meets the USBs Electrical & Timing Specifications. Using passive cables to entend the length of a USB cable can result in signal errors and is not recommended. The USB Active Extension Cable acts as a transparent USB Hub and buffers both upstream and downstream data traffic. The cable comes in both 8- and 16-foot lengths and can be daisy chained in order to reach up to 80 feet in length.