There are also 18 programmable keys that allow for rapid navigation to applications you use frequently. The Logitech Constant Curve layout is similar to regular keyboards but eases the stress on your wrists and allows for more comfortable working. The Logitech MK550 Wireless Wave Keyboard and Mouse uses an ergonomic wave design for more natural typing when working. No difference form a new one but save you a lot. It doesn't have any cosmetic issues comes with all original parts, manuals, components in the original package. The player was tested and fully functional. Legal Disclaimer: A customer returned this product in like new condition. SIMPLE SETUP - There's no additional setup involved when using the MK550-simply plug in the Unifying receiver, and you're ready to go.The K350 keyboard has a battery life of up to 3 years, and the mouse, up to 2 years, with 2 standard AA batteries in each device LONG BATTERY LIFE - Use your keyboard and mouse for longer with the MK550's extended battery life.PRECISION-LASER MOUSE - Say goodbye to your touchpad with the included MK510 precision-laser mouse.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.The layout is familiar, so there is little to no learning curve to begin using it fluidly ERGONOMIC WAVE DESIGN - The MK550 uses Logitech's Constant Curve layout for reduced stress and better, more natural typing.

Logitech ergonomic keyboard mk550