More than 50 euros nomadic mouse, there are defects that can not be tolerated, especially when they are known to the manufacturer and that it does not react. Edit a serial production item costs money, of course, but when the defect is so big, that we called and that Logitech sells its product to this price, it does. Instead, Logitech continues to quietly sell his faulty mouse. Let me explain the different plastics that mediate between the buttons and clicks mechanisms are inappropriate and generate static electricity. Result: after several hundred clicks, static electricity is accumulated and mouse is double-clicks or triple-clicks at a touch of a button. This is a very rough design error. I have scoured the forums and found that many people had had this problem, replacement or repair of their mouse ... and had the same problem again. A technician from Logitech recommends disconnecting the receiver, remove the batteries and click the buttons non stop for 30 to 60 seconds to remove static electricity. I did, and it allows the mouse to work again ... for a few hundred clicks and the problem reappears. Damage: everything else, this mouse is perfect, this is probably the best mobile mouse market today. But this defect is unbearable, especially if you use this mouse intensively. Move along.