This is a 5-pack of 1m USB C 3.1 male to USB A 3.0 male black adapter cables. Each allows your USB C 3.1 equipped MacBook, laptop or PC to connect to any USB A 3.0 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.