Piece of shit, does not worth buying. I wanted to buy a cheap mouse with a wheel. The wheel does not work on mine. I try to scroll up and it scrolls down, or it just scrolls randomly, it is unusable. I click once and it often does a double-click instead if I press the button lightly, which is quite annoying. Sometimes the mouse pointer just starts to move around randomly, even when I don't touch the mouse at all. I do not recommend it to anyone.