The Trackbar Emotion was mindfully created for both preventative as well as rehabilitative use for people concerned about upper limb disorders (ULD's).It was built on the principle of centering the pointing device between the user and keyboard (defined between keys G and H). This positioning keeps the user's hands and arms in a more natural position during keyboard and mouse work. Employing this principle, this product reduces or eliminates sideways or reaching arm movements that can increase the risk of developing ULD's.Symmetric design allows the use of both hands evenly. Used either with the roll closer to the keyboard or closer to the body.Programmable buttons require only 50-70grams of force to activate (most mice require 2-3 times that!) and allow user to speed up repetitive functions - significantly reducing the strain of "mousing".Roll bar is much larger in diameter than other roll-using peripherals allowing for precise cursor motion with less manual effort, greater comfort and a quicker learning curve.Equipped with 5 programmable buttonsPersonal choice - Trackbar Emotion is made to work either with the buttons close to you (the default position) or rotated 180 degrees and close to the keyboard. Press the button on the underside of the device to make the switch.Supplied with a USB cable and a PS/2 cable.