This is a set of internal circuit boards for a Basic Optical Mouse, USB/PS2 compatible, model X09-13962. The model number of the main body is shown in the second photo. Includes the main circuit board, scroll wheel unit, LED reflector parts, screws and weights, USB cord, and body stickers. Mouse feet and stickers that were attached to the body are also included. The adhesive has been removed. It was working without chattering when last used, but it is a junk item and there is no warranty. How about using it for the circuit board of a DIY mouse or for replacement parts? Feel free to ask if you have any questions!