USB port-based wired connection; plug and play, no drivers required A full-size 19-key number pad with a strong "000" key significantly increases productivity. Comfortable, wear-resistant, anti-slip, and anti-drop typing Lightweight and thin, it fits easily in a laptop bag for portability. Ideal for those who use notebooks or work in banking and accounting Compatible with Windows XP, Windows 7/8, Windows 2000, and Windows Millennium Edition Dimensions: 14 x 10.2 x 1.5 cm 1.2m of cable USB port