Power your 5V DC devices from your computer through a USB (Universal Serial Bus) port. Tired of having to carry around a separate wall adapter in order to power or charge your 5V devices, such as certain external hard drives, streaming media players, & Bluetooth speakers? This 2m USB (Universal Serial Bus) power cable makes it easier to power 5V DC devices that have a Type N barrel power connector. You can power or charge the devices through an available USB (Universal Serial Bus) port on your laptop or desktop computer.