This Logitech T-BC21 804377-0000 Marble Wired USB Trackball Mouse is a great addition to your computer peripherals. It is a unit that comes with programmable buttons, ergonomic design, and a scroll wheel. The device is gray in color, built with a trackball tracking method and four buttons.

Please note that this item is being sold for parts only.

The mouse works but the wire has a few frays as it was cut by mistake. The left buttons work but the right buttons did not operate. (See photos)