Tip :
if you wish to take it apart, there are only 3 screws, all are at the bottom of the mouse, 2 are at the side part of the plastic, then one in the middle, in the metal, turn the mouse over and then you can open it form the middle, open it to a 45degree and the front part is held by plastic slits, when i opened mine, i just kept increasing the degrees, did no damage to the slits.