Laser mouse problem!

Users questions: Today's buy of Logitech G3 Laser Mouse is the first time I felt sensitivity pricey but there is a problem with it: that when I get up and leave when the mouse when the contact surface (the case is not very far inside the bar about 7-8CM ) mouse can actually be controlled. . . I do not know that I still buy a Mars Are counterfeit laser mouse like this? If so I can not change it I do not want to pick up the mouse when the mouse will move. .
Experts answer: Yes, this laser mouse can not change the
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