MK550 Wireless Wave Keyboard and Mouse Combo gives you a comfort curve without the learning curve. Your hands get cradled in comfort by the Comfort Wave design. The laser mouse keeps your hand supported with contoured sides and soft rubber grips. The mouse and keyboard are so energy efficient you just might forget they use batteries at all. The Logitech® Unifying receiver connects both the keyboard and mouse, and you get long-range advanced 2.4 GHz wireless connectivity.