Logitech Trackman Marble Trackball – Wired USB Ergonomic Mouse for Computers, with 4 Programmable Buttons, Dark Gray : Electronics - Amazon.com
Logitech TrackMan Marble Wired trackball mouse, 300 DPI optical sensor Marble, USB port, for right or left-handed, PC / Mac - gray / red, English Packing: Amazon.de: Computer & Accessories