This lot of 3 vintage Logitech trackball mouse is perfect for those who prefer a classic and reliable design. The two-button PS/2 wired ball mouse is made by Logitech for IBM ensuring quality construction. The WHITE color and mechanical tracking method are complemented by the rollerball feature, making it a comfortable and efficient device to use. The mouse is a model M-S34. They are wired and are compatible with computers that have PS/2 connectivity. With its 2-button functionality, it is suitable for basic tasks such as browsing and document editing. This Logitech trackball mouse is a great addition to any collection and is sure to provide a smooth and precise experience. All are tested & works.