Thank you very much for viewing! It can still be used without any problems!! I no longer need it as I have many mice. ・Logicool (Logitech) ・Wireless Mouse SW-M570 【Design that doesn't strain your arms and wrists】 The SW-M570 is a trackball mouse that reduces fatigue in your arms and wrists. 【Comfortable for long periods】 With its gentle curve, it's designed to be comfortable for extended use. 【Wireless connection】 Unifying compatible. Utilizing advanced 2.4GHz wireless technology, it provides a reliable connection without delays or dropouts. 【Up to 18 months with one AA battery】 Adopting power-saving technology, it can be used comfortably for up to 18 months without replacing the battery. It also features a convenient status indicator. 【Button customization】 You can customize the trackball buttons for faster operation. Resolution dpi: 540 Wireless method: Advanced 2.4GHz Connection I/F: USB, Number of mouse buttons: 5 Compatible with Windows/Mac/ChromeOS I am selling it because I am using a different mouse and have no opportunity to use this one.