Double waterproof design, with a piece of waterproof film and 30 water holes set in. Rounded shape, fashional design. Narrow border design, with LCD to display a fashionable appearance. 101 smooth and silent touch keys. Keyboard's knocking lifetime is over 8,000,000 times. Radium-carving button design, with characters which are hard to wear. PS2 interface and 800dpi high resolution. The mouse's ergonomic design for both hands conforms to optimal support and comfort. It fits any size of hands and you won't feel tired even a long time use. Operating system: Windows 95/98/2000/ME/XP/VI