> For the complete documentation index, see [llms.txt](https://docs.sevenpens.com/drawtab/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.sevenpens.com/drawtab/guides/pens/pen-teardown-huion-pen80.md).
# Pen teardowns
## XP-Pen X3 pen
See this Reddit post:
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## Huion PEN80
The Huion PEN80 is a VERY OLD Huion pen. It uses an active EMR design, meaning it uses a rechargeable battery for power instead of getting power from the tablet. Again, it is very old, and newer Huion pens like the PW517 and other models are passive EMR pens.
I mentioned the Huion PEN80 in my 2022 EMR video as an example of one older method in which pressure information is transmitted from the pen to the tablet.
* The nib fits into the hollow ferrite rod.
* There is enough pressure in the ferrite rod that the nib does not fall out.
* The nib does not go all the way through the ferrite rod. There's about 2 mm left inside the ferrite rod.
* The spring touches the ferrite rod.
* The plastic piece fits into the spring.
* The wires from the inductor coil to the circuit board have been cut to make it easier to present.
* The wires from the circuit board to the rechargeable battery have been cut to make it easier to present.
* Panda Tech: Huion Pen80 Disassemble & Reassemble ()