Too uncommon, so this mouse style spreads it will make them cringe physio because ergonomics is ideal for working long hours in a natural position .. The DPI button above to increase or decrease the sensitivity. Too bad there have no light to see which setting is used. Precise knob, the buttons are conveniently placed with a special mention for the 4 and 5 buttons at the top and bottom of the thumb those that make it readily available ... The parties allow rubberized grip that prevents the mouse from slipping in your hand The altar at the back is removable that allow everyone to test its usefulness ...... Personally I do not have in the utility It will require a grip but it goes very fast and once tested it is difficult to do without this mouse model, so that I replaced the mouse with the PC in my home
To advise all those who must work (or play) long hours at the PC ....
