Foldable wireless USB 2.0 Mouse/ Mice. Wonderful wireless mouse. The optical mouse is designed with reliable optical technology, convenient to use. Intelligent connectivity, no need to code, plug-and-play. The unit uses 2 AAA batteries (not included). Cursor frequency: 1600 CPI. Transmission distance: 6 to 10 meters. 3 keys. Compatible with Windows 95, 98, ME, NT 4.0, 2000 and XP Windows 7.