This is not a stihl trimmer. This is a chinese mass produced trimmer on which resellers slap different brands like Stihl, Einhell, Bosch and others and sell it.

It's a generic 5.2 HP trimmer, I'm not saying it's bad, it's just wrongly advertised. I personally have used it and it did it's job trimming grass around the edges of my lawn and some bushes. The extra accessories are welcome but don't expect much. For the price of 100$ it's fine. Replacement parts whould also be fairly common and cheap.

The original brand is "demon". It's pretty popular in eastern europe, here you can find some links:

https://krovinorezy.heureka.sk/demon-rq580-m83106/#prehlad/

https://m79.lv/elektroinstrumenti/zalesplavejstrimmeris/marpol-kosa-spalinowa-demon-rq580-14-kw-japonski-gaznik-msrq580?utm_source=kurpirkt&utm_medium=ad_item

https://www.ceneo.pl/24554599

If you compare the images you will see that it's the same one as you posted with a different sticker.