■ Description This is a Kailh rotary encoder (mounting height: 5mm). It is mainly used for detecting the scrolling of a mouse wheel. If your mouse wheel is no longer scrolling properly, replacing this part will often fix the problem. This rotary encoder is used in Microsoft Surface mice, etc. ■ Notes ・Returns are not accepted, so please make sure this is the correct part for you (especially the 5mm mounting height). ・The ruler in the photo is for size confirmation and is not included with the product.