I needed a new mouse, one to one when b110 is a bit annoyed, I went to the computer downstairs from me he said "the kings of the mouse is Logitech" I therefore went to see it, I took it and the ... I do not see how to make mice more perfect than these, comfort, esthetic, an accuracy of just psychopath, so: comfort top, adjustable in hyper fast scrolling mode by pressing a button on the mouse mode Flanker or sensiblilité is "usual", the buttons on the side are used for example to copy / paste to previous / next, close the tab / open the last closed tab etc ... without touching anything other than jewelry, some games are already programmed macros buttons and thus serve to attack without double-clicking on an enemy that move or having to press ctrl ... you can play games with one hand in the slip, and I not joking, for those who know, I did the portal Zeta dark orbit hand in the calbard and frankly it's still very simple with this monster, I recommend this treasure to the death to anyone who wants a dream ... mouse to good word, hello, get there, you will understand me.