This is a 1.2m USB 3.1 male to male Thunberbolt®-compatible black cable. It allows your USB 3.1 (C) equipped MacBook®, laptop or PC to connect to any USB 3.1 (C) equipped device, such as a smart phone, tablet, or external hard drive, and including devices that support Thunderbolt®. Our cables are backed by a 3 year warranty and are guaranteed to work the first time.