The A4TECH WWT-13 Scroll Track 4D TrackBall is a large mouse designed for comfortable use with a programmable middle button and scroll wheel. This trackball features a mechanical tracking method, dual wheels for precise control, and 100% Microsoft wheel functionality. The gray color and comfortable grip make it a stylish and easy-to-use option for navigating through your computer or tablet with ease. Its PS/2 connectivity ensures compatibility with a wide range of devices from the 90s and beyond.