USB Extension cables, also known as USB extension leads, provide connection from computers to peripherals, and are similar to standard USB cables. However the primary functionality for USB extension cables is to extend the functionality of a USB port which cannot be easily reached. The majority of USB extension cables go from a male USB connector to a female USB connector. RS have a varied range of USB extension cables that can support either male or female USB A, USB B, Micro USB B and Mini USB B connectors, and features products from trusted brands such as Harting, Startech, and our own RS PRO, among others. Where are USB extension cables used? USB extension leads are available in various lengths to suit a range of applications and can vary from around 0.5m to 35m. Types of USB connectors: Alternatively if you have a peripheral such as a printer, of which the cable is too short to reach the USB port, the extension cable can be used to breach the distance between them. With the extension cable, you do not have to rely on a wireless network to locate the printer, which also requires the printer (or other peripheral) to be within close proximity to the computer and this may not be possible. How long are USB extension leads?