[haunter]

See the R36S clones from China

https://www.aliexpress.com/item/1005006152991376.html

[jsheard]

If we're counting emulation they can get even smaller than that, practicality be damned.

https://www.funkey-project.com

[pryelluw]

I already own a miyoo with the emus though I meant something that replicates the original hardware and can run the actual game cartridges/ISOs