Enhance your computing experience with the Microsoft Trackball Explorer 1.0. This ergonomic trackball is designed for comfort and ease of use. Its USB and PS2 compatibility make it versatile and suitable for all your computing needs. The optical tracking method ensures precise movements, making it ideal for both personal and professional use. This trackball is a must-have for anyone who spends hours in front of the computer. Its sleek design and compatibility with various interfaces make it a perfect addition to your workstation. In good condition and working well.