The ergonomic CHERRY KC 4500 ERGO keyboard can reduce or eliminate shoulder tension or other unpleasant symptoms when working at the computer. Due to its special design, your hands and arms assume a natural position, relieving the stress on your shoulders. In addition, the soft palm rest allows your hands to rest comfortably and prevents pressure points.CHERRY MW 4500 Particularly ergonomic shape in 45° design.6 buttons and scroll wheel