100% Brand new high quality USB finger optical mouse. Resolution: 1200 dpi for quick and precise movement USB interface, also works for PS/2 (adapter not included). Plug and play, no installation needed 3 buttons with scroll wheel. Digital encoder technology, operate precisely, prevent faulty movement effectively. No mouse pad required. Sliding on any surface Suitable for both right and left hand user. Textile coating cable (not rubber coating) - enhance free and easy movement. Compatible with MS Windows 98/2000/me/XP/Vista and Mac OS 9 and above.