The Vintage Compaq 2-Button Beige Trackball PS/2 Wired Mouse MUS9J is a classic piece of computing history from the era when trackball mice were commonplace. Made by Compaq in China, this vintage mouse features a unique trackball design that allows for smooth and precise cursor movement. Although untested, this nostalgic piece would make a great addition to any collection of vintage computing artifacts or as a functional mouse for users who appreciate retro technology.