This is a 1.2m USB C 3.1 (Male) to USB C 3.1 (Male) Thunderbolt-compatible Sync and Charge Black Cable, 40Gbps, 8K 60Hz. It allows your USB C 3.1 equipped MacBook , laptop or PC to connect to any USB C 3.1 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.