Wireless three-button mouse delivers comfort and reliability and keeps your desktop clutter-free. Comfortable contoured shape feels great in either hand. The 2.4 GHz wireless nano receiver provides long range and minimal interference and stores inside the battery compartment. High-definition optical sensor (1000 DPI) delivers precise responsive control. A low-battery indicator alerts you when you need to replace the two AA batteries (first set of two included). PC and Mac compatible mouse features a scroll wheel with middle button and an on/off switch. Mouse works with Mac, Vista, Windows 7 and XP.