Logitech 910-001882 IR Wireless Wireless Trackball M570 - Newegg.com
Logitech's Lift is a vertical mouse that's easier to grasp | Ars Technica
Review: Logitech's Lift vertical mouse helps control RSI | Computerworld
Logitech's Lift is a vertical mouse that's easier to grasp | Ars Technica
Amazon.com: Logitech MX Vertical Wireless Mouse – Advanced Ergonomic Design Reduces Muscle Strain, Control and Move Content Between 3 Windows and Apple Computers (Bluetooth or USB), Rechargeable, Graphite : Electronics