This 7 port USB 2. 0 hub connects to one USB 2. 0 port on a Mac or PC computer, adding seven USB 2. 0 ports - allowing you to maximize the number of high speed USB peripherals connected to your computer. The hub supports cascaded installation with other USB 2. 0 hubs, supporting up to 127 USB 2. 0 device connections - a scalable solution for connecting multiple USB devices to a single host computer. The 7 port hub includes a wall-mount power adapter, but can be powered through USB bus connection to the host computer - allowing you to install the hub as needed without worrying about the availability of a power outlet.