The side button (image 3) has come off, rendering it completely unusable. The surface of the mouse is slightly sticky, but I don't think it's very noticeable. It's perfectly usable as a regular mouse. Please understand that this is a used item before considering a purchase. To prevent swapping, we cannot accept returns or complaints after you receive the item. Please understand that this is a no-claims, no-return sale. Thank you for looking. Thank you for looking. Connection type... Wired