Logi cool Logitech MX ERGO MXTB1s Trackball Mouse (Unused receiver and cable) This is a junk item. I purchased it from the official Logitech store on Rakuten Ichiba in August 2022 and used it for approximately 3 years. It's still barely usable, but the sensitivity of the left click has decreased, and sometimes it doesn't respond smoothly when clicked, so I'm selling it as a junk item. In addition, the part where you rest your hand has become whitish due to use, and there are black stains on the metal plate on the bottom that cannot be removed by wiping, indicating deterioration. I will also include the unused charging cable and receiver. Please purchase only if you agree to the above.