This is an 8in Lenovo 4X90E51405 compatible USB A 3.0 male to RJ-45 female network adapter cable. It allows your USB A 3.0 equipped MacBook , laptop or PC to connect to an additional RJ-45 gigabit Ethernet port. The USB A 3.0 SuperSpeed connector also grants backwards compatibility to any USB A 2.x or USB A 1.x equipped device. This small, lightweight and portable USB network adapter cable is the ideal network accessory for the home or office. Our network adapter cables are backed by a 3 year warranty and are guaranteed to work the first time.