This is the wired trackball mouse EX-G (model number: M-XT2URBK) from Elecom (ELECOM). It has been tested and confirmed to be working without any problems. There are small scratches, but the overall condition is good. It has been cleaned and is ready to use. It is a USB connection type, allowing for stable operation. It's a thumb-operated trackball, which reduces wrist strain and allows for comfortable work.