Amazon offers a vertical wireless trackball Kensington Pro Fit for $69.99. The current offer typically approaching $90 is good for a discount of over 20% and is within cents of the Amazon all-time low. A trackball mouse has won over the years a cult and Kensington’s Pro-Fit gives this shape to ergonomics. This is the most important thing. Nine programmable buttons are available, Multi-computer connectivity, and compatibility for both Mac and PC. More than 100 clients left 3.7/5 stars.
Ergonomist-Approved Design – All-day comfort is provided through an ergo design with a 60° tilt and natural handshake position to improve wrist and forearm position
Easy to Use – Uses the same left click right click and scroll wheel operation as a traditional mouse while providing the advantages of a trackball with a simple roll of the thumb
Premium Precision & Speed – The high-quality optical tracking sensor 34mm thumb-operated trackball and triple DPI switch provide smooth cursor control optimal precision and easy cursor speed transitions
Flexible Wireless Connection Options – Connect your vertical trackball to up to 3 different devices – one via the 2 4GHz nano dongle that stows inside the trackball body and two additional connections via Bluetooth
Plug & Play or Customize – Experience plug and play default settings or use KensingtonWorks software to set pointer and scrolling options and professionally customize 9 programmable buttons to tackle common tasks with one-touch