No delays or dropouts. The tiny wireless receiver gives you a connection you can count on. With 12 months of battery life, you don?t have to deal with the hassle of frequent battery changes. You?ll enjoy the high quality and reliability Logitech is known for?plus a 3-year limited hardware warranty. System Requirements : Windows? XP, Windows Vista?, or Windows? 7, Windows? 8,USB port. Mac OS? X 10.4 or later , USB port. Linux? : Linux? kernel 2.6 or later, USB port. Package Contents : Mouse, Nano receiver ,1 AA battery (pre-installed), User documentation.