After testing this mouse LOGITECH art for a week with my wife, I confess I am a little disappointed. With the touch endoit the middle, it lacks the precision we know with the wheel and is Souvant possible to touch the left and right buttons instead of the touch endoit (missing a benchmark). In addition, if your fingers are too dry, it is not possible to drag (scroll) the pages. Even the perfect size - not too large nor too small - not me convainqu to keep this machine. I changed another product against more adequante LOGITECH for me.