The Goji G1MFLBL17 USB A to Micro USB B Cable is handy for connecting your smartphone with a power bank whenever you need extra charge from a portable battery.When using the cable with a power bank, just plug the Micro USB B side into your smartphone, and then plug the larger USB A connector into your portable power bank.It's an easy way to connect, charge and transfer data between different devices featuring USB A or Micro USB ports. With its one metre cable, it's best for connecting devices that will be close to one another