This hub supports Hi-Speed data transmission rates up to 480Mbps. Perfect for both the mobile and desktop user.The hub works perfectly without external power, a compact, multi-voltage AC adapter (110/220V ) has been provided for the rare circumstance when connecting a power hungry device. This USB 2.0 device is backwards compatible so that it will function with both USB 2.0 devices as well as USB 1.1 peripherals.