The Logitech T-BC21 Marble Wired USB Trackball Mouse is an ambidextrous mouse with a unique trackball design, allowing for precise cursor movement. With a maximum DPI of 300 and side to side scrolling feature, this mouse is perfect for users who prefer a trackball for their pointing needs. The mouse is wired and can be connected via PS/2 or USB, making it versatile for different setups. The gray color and sleek design make it a stylish addition to any workstation.