Used . Tested & fully functional. Personally owned and used. Buy before Friday, and purchase will be schedule to ships out on Friday to the lower 48 states with USPS , UPS, or FedEx depending on weight and dimension of the package. The Logitech Trackman Marble USB T-BC21 Mouse is a used trackball mouse with a maximum DPI of 300. It features a thumb button for easy navigation and has a total of 4 buttons for added functionality. The mouse uses optical tracking method and is connected via a wired USB connection, ensuring a reliable and responsive performance. This model is tested and confirmed to be in good working condition, making it a suitable choice for those in need of a dependable input device for their computer setup.