ERGONOMIC WAVE DESIGN: The MK550 uses Logitech's Constant Curve layout for reduced stress and better, more natural typing INTEGRATED PALM REST: Experience lower wrist fatigue with the integrated palm rest, three options for leg height allow you to adjust the keyboard to the height that feels most comfortable to you PRECISION LASER MOUSE: Say goodbye to your touchpad with the included MK510 precision laser mouse; the mouse and keyboard are so energy efficient