The side button (image 3) has come off, rendering it completely unusable. The surface of the mouse is slightly sticky, but it's not very noticeable. It functions perfectly well as a regular mouse. Please consider this item, understanding that it is a used product. To prevent product substitution, we cannot accept returns or complaints after the item has been received. We appreciate your understanding. No claims, no returns. Thank you for looking. Thank you for looking. Connection type... Wired