The Logitech Cordless Trackman Wheel Mouse is a silver trackball mouse designed for ergonomic use with a scroll wheel for added functionality. This wireless mouse operates with optical tracking method and has a maximum DPI of 1000. With two buttons, this Logitech model (T-RA18) does not come with a receiver or charger included, making it a convenient and sleek option for those looking for a reliable trackball mouse for their computing needs.