The cable is 30 cm long, both ends of the interface have the ROG logo, this small short cable can be your old equipment such as action camera, DSLR camera, DAC decoder, Micro USB interface microphone and other old equipment, all can be connected to the new device new USB-C, thunder 3, thunder 4 interface through this line. Use this cable to charge an older Micro USB Android phone or tablet via a new MacBook Pro, ChromeBook, or other USB-C, Thunderbolt 3, or 4 port device