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Ergonomic Vertical 2.4G USB Wireless Trackball Mouse$46.20
Ergonomic Design with Smooth Thumb Control: The optimal angle of the trackball mouse allows you to keep your palm in a natural position for all-day comfort. Precise Tracking with Adjustable DPI: 1000- 1600-2400 DPI. 7 Buttons High Performance: Plus the back and forward button, you ...Ergonomic Design with Smooth Thumb Control: The optimal angle of the trackball mouse allows you to keep your palm in a natural position for all-day comfort.
Precise Tracking with Adjustable DPI: 1000- 1600-2400 DPI. 7 Buttons High Performance: Plus the back and forward button, you can operate easily with higher productivity as well as added comfort. Wireless trackball mouse 2.
User Manual