USB wired connection via USB port, no drivers needed, plug and play Full-size 19 keys number pad, including a powerful "000" key, greatly improve work efficiency Anti-slip, anti-drop, wear resistant, comfortable typing Slim and lightweight, easily placed in laptop bag for easy carrying Perfect choice for notebook users or bank and accounting users Supports Windows 2000, Windows Millennium Edition, Windows XP, Windows7/8 Size: 14x10.2x1.5cm Cable: 1.2m Port: USB