This 4 Port USB 2.0 Hub connects to one USB 2.0 port on a Mac or PC computer, adding four 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 4 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. The USB 2.0 hub offers an attractive black casing that suits any operating environment and includes a 3ft USB 2.0 A/B male-male cable, for the connection between the hub and the host computer. Features -Choice of Bus Power and/or External Power Adapter. -Compact space saving design. -Hot Plug and Play feature allows devices to be connected or disconnected without turning off the PC. -Maximum data transfer rate of up to 480 Mbps and backwards compatible with USB 1.1. -Quick, easy installation.