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An asynchronous USB numeric keypad format allows the keypad to work independently of the keypad on your notebook. The mini optical USB mouse with 27" retractable cord works on virtually any surface and includes a quiet scrolling wheel - it offers 480dpi resolution and 450mm/s tracking speed. The USB 2.0 4-port hub allows you to connect up to four USB peripherals to your notebook and supports high-speed data transfer rates. An included compact, zippered case protects contents and provides easy portability.