USB devices are everywhere. If it's an external device, chances are it uses the USB interface. This DigiPower USB Data Transfer Cable uses a micro-USB plug, most commonly used on phones or small peripherals. So with this, you can plug in a micro USB device to a full-sized USB port. This can come in handy if you lose the USB cable that came with your phone for example, since you can plug this into the charger as a replacement. Of course you can use it with other devices like audio DACs, external drives, or MP3 players. This is one of the most versatile cables you can have in your home.