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Numerous Output voltages from one battery Pack?

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RHH1095:
Has anyone reviewed or performed a teardown of this Li-Ion Battery Pack. 
NB7102. Capacity: 3.7V/17500mAh 64.75Wh

https://www.amazon.com/TalentCell-NB7102-Rechargeable-17500mAh-Smartphone/dp/B07RDFM55J?th=1

I am curious how the output plug knows how much voltage to supply to the load.

About this item
Modle: NB7102. Capacity: 3.7V/17500mAh 64.75Wh
Output: DC1: 29.4-21V/3A DC2: 19.5V/3A USB-A: 5V/2.4A 12W Max. USB-C: 5V/3A 9V/3A 12V/3A 12V/3A 20V/3A 60W Max.
Compatible with most Laptops, Notebooks, LED strip light products, CCTV Camera, LED Panel, Modem, Speak, Car DVR, Router etc. We Provide 12 Kinds of Connector for Most of the Popular Laptops, please Make Sure the Connector Fits for Your Laptop before purchasing.

SparkyFX:
The USB-C Standard includes a protocol to negotiate the output voltage / power. The device tells the power bank what it wants. Otherwise it will probably fall back to older standards and supply the 5V / 100mA minimum.

RHH1095:
Thank you! 

I found this silliness on YouTube and thought it was more complicated. Lol

https://youtu.be/SJkx8HRmCTQ

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