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The Ploopy Mini Trackball. Completely open-source! Runs QMK, of course. All design files are available. Check comments for details! : r/olkb
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YUMQUA Portable Finger Hand Held 4D Usb Mini Trackball Mouse/Fits Left and Right Handed Users Great for Carpal Tunnel Laptop Lovers : Amazon.co.uk: Computers & Accessories
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YUMQUA Portable Finger Hand Held 4D Usb Mini Trackball Mouse/Fits Left and Right Handed Users Great for Carpal Tunnel Laptop Lovers : Amazon.co.uk: Computers & Accessories
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EIGIIS Ergonomic Handheld Trackball Mouse Wired Mini USB Portable Finger Travel Computer Right Left Handed Mice for PC Laptop Mac Window OS Linux Unix: Amazon.co.uk: Computers & Accessories
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Onsinic Mini Trackball Mouse Laptop Usb Gaming Mouse Orbit Trackball Mouse Wired Portable Game Usb Computer Mice: Amazon.co.uk: Computers & Accessories
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