This useful device means that you can extend the distance between your USB (Universal Serial Bus) Peripherals & your computer by up to 50m, using inexpensive CAT5 or higher cable. It comprises a local unit, which must connected directly (not via a hub) to a USB (Universal Serial Bus) port on your computer, & a remote unit with a built-in bus-powered USB (Universal Serial Bus) 1.1 hub for connecting up to 4 peripherals. CAT5 or higher network patch cable (not included) is required to connect the two units together. Please note: Standard CAT5, 5e or 6 network cable can be used with this product but is not included & must be purchased separately. We supply suitable CAT5e & 6 cable in different lengths & colours. Connecting additional USB (Universal Serial Bus) hubs Further USB (Universal Serial Bus) hubs can also be connected but the maximum cable distance is reduced by 10m for each hub. An optional power supply has to be connected to the hub, for self-powered operation, as soon as the connected devices require more than 250m A of current from the USB (Universal Serial Bus) bus.