The PORLEI Wired Trackball Mouse Model (TM551) is an ergonomic computer mouse designed for comfortable use. With a sleek design and wired connectivity, this trackball mouse is easy to set up and use. The compact size makes it suitable for use in tight spaces, while the lightweight construction makes it easy to carry around. The PORLEI brand ensures quality and reliability, making this trackball mouse a great choice for anyone in need of a dependable pointing device.