This is the M-IT11DRBK trackball, which features a ball supported by bearings for light operation. I purchased it six months ago and used it with my home PC. I haven't used it for work, so I think the usage time was short. However, since it is a used item, please understand that there are some signs of use, although they are not very noticeable. Also, I have discarded the outer box, so I will pack and ship it without the box. The included items (photo 5) are the wireless dongle (attached to the back of the trackball for shipping), a bearing replacement tool, and rechargeable batteries (for operation check), for a total of three items. ❶ Brand: ELECOM ❷ Model Name: M-IT11DRBK ❸ Type: Trackball ❹ Number of Buttons: 5 ❺ Communication Method: Wireless 2.4GHz ❻ Ball Diameter: 36mm, Bearing Model (photo 6) Please access the manufacturer's website to obtain the instruction manual and software. The address is as follows. These were not originally included. (Photo 7) https://www2.elecom.co.jp/search/link/search.asp?kataban=M-IT11DRBK&link_type=2