3 button(left + right + wheel/side button) + 1 wheel. Enhanced wheel scrolling technology. MS-IntelliMouse compatible. Much easy scrolling up/down, left/right. 1 programmable button. 520 dpi, 30% faster than any others. Zoom and auto-scroll in Office 97/2000. Windows 3.1/95/98/NT/2000 driver included. Model Type:PS/2 and Serial.
