https://www.lenovo.com/sg/en/glossary/touch-screen-pen/
How Does a Touchscreen Pen Work? Types of Pens Available | Lenovo Singapore
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https://forums.opensuse.org/t/lenovo-x1-yoga-gen-1-type-20fq-touchscreen-touch-pen-not-working/114796
Lenovo X1 Yoga Gen 1 Type 20FQ: Touchscreen (touch, pen) not working - Hardware - openSUSE Forums
Feb 16, 2016 - New Lenovo X1 Yoga Gen 1. Originally installed openSUSE 13.2 (no Wifi, no touchscreen), then upgraded to Leap 42.1 (direct install did not work, blank screen)....
https://cncygift.en.made-in-china.com/product/pUrRwkyGJtcP/China-Cute-Plush-Doll-Head-Can-Printable-Logo-Cartoon-Touchscreen-Pen.html
Cute Plush Doll Head Can Printable Logo Cartoon Touchscreen Pen - 14cm Pen and Wholesale Office...
Cute Plush Doll Head Can Printable Logo Cartoon Touchscreen Pen, Find Details and Price about 14cm Pen Wholesale Office Stationery from Cute Plush Doll Head...