This is an ELECOM trackball mouse. Model number is M-HT1URXBK. It's an eco-friendly wired type, so you don't have to worry about batteries. The buttons were caught and damaged when I carried it in my bag. After that, I used it with the buttons taped on, and the wheel sometimes didn't work well depending on how I attached them, but it worked almost perfectly when attached correctly. I've used it for about a year, and I haven't used it very often, so I think it's clean and still usable, but I bought a new one for aesthetic reasons, so I'm giving this one away. I will include the box and instruction manual that came with the new one. My child tore the edge of the box, so I taped it. It works without problems, but it may not function correctly depending on how the buttons are repaired, so it is being sold as junk. I would like to give it to someone who can repair it, or who wants to use it for parts since it is a discontinued product. Thank you. ELECOM list price: ¥14,762