Product Name: EWIN Wireless Ergonomic Mouse Trackball Condition: Used, but tested and confirmed to be working without issues. While there are no major noticeable scratches or stains overall, there are minor scuffs and signs of use consistent with normal wear. Please check the photos for the condition. Product Description: This is a wireless ergonomic trackball mouse made by EWIN. It features an ergonomic design to reduce strain on the hand, making long hours of PC work more comfortable. Because it uses a trackball, you don't need space to move the mouse, which is recommended for those who want to use their desk space more efficiently. The wireless connection eliminates the hassle of cables, creating a clean desk environment. It supports connection via Bluetooth or a 2.4GHz USB receiver. This is a great item to try for those looking to improve PC work efficiency and reduce wrist strain. Included Items: • Main unit only ※USB receiver and instruction manual are not included. Please purchase if you know how to connect it. Other: • No smokers. • Please understand that this is a used item before purchasing. • Feel free to ask any questions in the comments. To those considering a purchase: This trackball mouse is especially ideal for those who want to reduce wrist strain and make effective use of their desk space.