The Microsoft Trackball Explorer 1.0 mouse is a versatile device that offers both PS2 and USB connectivity options, making it compatible with a variety of computer systems. Its ergonomic design and optical tracking method provide a comfortable and efficient user experience, while the scroll wheel and 5 buttons enhance functionality. In a sleek gray color and featuring a trackball control method, this mouse is a reliable and convenient accessory for navigating through your computer with precision and ease.