The app enables you to set a pin-code protection to your USB flash drive. Once this has been done, the drive is effectively locked until the correct pin is entered. Once the drive is locked, one cannot read nor write any data to it without the correct pin and the fact that the software is available for Windows and Android means that it is ideal for anyone who works with PC or Smartphone. NOTE: You need a USB flash drive (or micro-USB adapter) to use the App on your Android Smartphone.