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Ergonomic Design with Smooth Thumb Control: Move your cursor by the smooth trackball instead of moving your wrist and arm. Let the easy and smooth

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Wired Vertical Mouse, Optical Ergonomic Mouse with 4 Adjustable dpi 800/1200/2000/3200, 6 Buttons USB Computer

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Ergonomic Mouse Optical Vertical Mouse 6 Keys USB Wireless 2.4GHz 2400DPI for PC

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2.4G Wireless Trackball Mouse Ergonomic Vertical Optical USB Wired Mice Portable Handheld Air Mouse For Office Laptop PC PPT - AliExpress

DIGITUS by ASSMANN Shop Ergonomic Vertical Wireless Mouse

★ ERGONOMIC DESIGN - EIGIIS handheld trackball mouse wireless can greatly avoide the harm of palm and muscle of your wrist for long time using mouse.

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EIGIIS 2.4G Ergonomic Trackball Handheld Finger USB Mouse Wireless Optical Travel DPI Mice for PC Laptop Mac Left and Right Handed : Electronics