Thank you for viewing. Body only. I tried using it, but it didn't quite suit me, so I'm offering it to someone who needs it. The ball movement is smooth. The surrounding ring also has some play, but it's smooth. Since it's not new and it's an early model, there seems to be a difference compared to the latest models. I thought it was interesting that you can click the four surrounding buttons simultaneously. If you're interested, it might be good to try it out. The app can be downloaded from the website. Also, it would be interesting to deepen your understanding by utilizing introduction videos on YouTube as appropriate. There are no noticeable scratches on the main body, but please apply only if you understand that it is a used item. I will wrap it in bubble wrap and ship it. Kensington trackball with USB connection, characterized by a red ball. - Brand: Kensington - Model: Expert Mouse - Model Number: K64325 - Connection Method: USB - Ball Color: Red - Design: Trackball type