This is a wireless trackball (thumb-operated type) from the ELECOM EX-G series. Since you operate the ball with your thumb, you can use it in a space-saving manner without moving your wrist. Recommended for long hours of PC work and desk work. Model number: M-XT3DRBK-G Connection method: Wireless Operation method: Thumb-operated trackball Brand new, unused, operation confirmed, with box. Due to being stored at home, there may be minor scratches on the outer box. Please refrain from purchasing if you are looking for a perfect item.