First of all: Since the launch of their different models (~2016), NIU tend to rename their (sub)models every now and then. So depending on the year of delivery the same model might have a slightly different name which can get pretty confusing. Let’s take the model N as an example:
Starting in China as “N1 civic” it became the “N1” after Honda claimed civic as their brand, which is the same as the “N1s” in Europe (+extra specs for ‘oversea’, ~2017). Then in 2018 it became the “N1 sport” and after the latest renaming in 2019 all models lost its “1” and got a “Qi” so its now called the “NQi Sport”- Phew.
Because all this seems to be an ever-moving target, I moved this FAQ entry into a fullblown post over here.