In Chapter 7 Episode 2 we followed Emma Berry as she stumbled into a strange, alien facility far, far away from home. Short story shorter: it's a cloning facility and soon she'll be producing copies of herself in huge numbers. The cloning vats even allow for various sizes, ranging from 1/100th the size of the original up to 10k the size (in steps of 10)!
This is not one of the big Emmas! It's a regular human-sized Emma with an Emma 1/10 of her size on her shoulder pointing at some snarling, dagger-toothed monstrosity the size of a small house. And the small Emma has even smaller Emmas scurrying around her body, doing the same for her.
The tiny Emma in the ear works as an earbud. Period.
Disclaimer: The story, all names, characters, and incidents portrayed in this production are fictitious. No identification with actual persons (living or deceased), places, buildings, and products is intended or should be inferred.