Type comfortably with all the room you need. The keys are where you expect them to be. Glide from key-to-key for hours with LogitechÂ® Incurve Keysâ¢. Whisper-quiet, contour-edge, concave keys position your fingers properly. Contoured sides and soft rubber grips keep your hand comfortable, supported, and in control. You'll enjoy smooth, precise tracking on virtually any surface. A battery life of up to three years for the keyboard and eighteen months for the mouse practically eliminates the need to replace batteries*. *Keyboard battery life calculation based on an estimated two million keystrokes/year in an office environment. User experience may vary. Mouse battery life may vary based on user and computing conditions.