Owner of 2 pinecils here, there are buttons and a display that shows the current temperature and other stuff. I only just learned that there’s an app, it works more than fine on its own, out of the box.
I got that specific iron because I needed to power it from 12v, and it works very well on the USB PD power supply I already have for my laptop.
They always force me to get the 80$ lenses… Still pretty cheap, but it ends up more around 100$ so I only change every couple years.