See Shulchan Aruch Yoreh Deah 181. It’s not very complicated.
mommamia22 –
There are two opinions about what kind of removing peyos is forbidden. Either only a razor is assur or even a scissors which cuts close like a razor is assur (such as a kosher shaver). We are machmir like the second pshat. Anything which is not similar to a razor-cut is fine. Therefore I believe that a 2 is certainly fine, and even a 1. The only thing I would say is problematic is the clipper without an attachment, and even that might vary based on what it looks like after it’s done.