Laser mouse runs for up to three years on one set of batteries. Easily add up to five compatible wireless mice and keyboards to the tiny Unifying receiver that stays in your notebook. The sculpted, right-hand shape With Stealth thumb button guides your hand to a naturally poised position and places customizable control within your reach. Additional buttons will save time with the Forward/Backward buttons. Three thumb buttons let you move quickly between web pages or applications. Laser mouse also features laser tracking and hyperfast scrolling for precision navigating lists, slides and images. Laser mouse includes personalizer software, Unifying receiver and two AA batteries. Plug into a USB port on a PC (Windows XP, Windows Vista or Windows 7) or a mac (OS X 10.4 or later).