- Next-Gen Apple Pencil Could Work on Any Surface MacRumors
- An Apple patent reveals a trackball tip based Apple Pencil with advanced sensors that allows content generation on non-touch surfaces patentlyapple.com
- Apple just patented a trackball Apple Pencil that works on almost any surface 9to5Mac
- Apple’s S Pen alternative might work with iPhone, MacBook Pro, and even Apple Watch PhoneArena
- Apple patent reveals stylus that draws in air, no screen needed India Today
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