The Logitech Trackman Marble Trackball Mouse T-BC21 is a versatile and reliable mouse with a trackball design. It offers side to side scrolling capabilities and features a maximum DPI of 300 for precise control. With connectivity options including PS/2, wired, and USB, this mouse is compatible with a variety of devices. The sleek design in red, gray, or white allows it to easily blend in with any computer setup. Ideal for users looking for a comfortable and efficient pointing device, the Logitech Trackman Marble Trackball Mouse is a top choice in the market.