This is a 10ft USB 3.1 (C) to USB 3.0 (A) black adapter cable. It allows your USB 3.1 (C) equipped MacBook®, laptop or PC to plug into any USB 3.0 (A) equipped device, such as a mouse, keyboard, thumb drive, or external hard drive. Our adapter cables are backed by a 3 year warranty and are guaranteed to work the first time.