After a week of use, I have the following to say:

Positive:
1) Good price (purchased for 26 euros) for low-end headsets.
2) The microphone is worth it in this set.
3) The microphone can be folded into the headphones when not in use, so there is no risk of breaking.
4) You can hear your conversation partner clearly.
5) On-off switch on the cable, as well as volume control.
6) Cable included in the package to connect to another device for listening to music (mobile phone, mixer, radio) (although the microphone does not work on the mobile phone).

Negative:
1) After about an hour and a half of use, they start to feel uncomfortable and cause discomfort in the ears, so you need to take breaks. For long gaming sessions, forget about it.
2) The sound is low for me. With the headphones at 80 to 90, you can hear satisfactorily, but not well or perfectly. (It may also depend on the sound of certain games, much louder in videos on YouTube)
3) Moderate sound isolation.

Neither positive nor negative:
1) The size of the headphones is for "big heads." I would say mine belongs to the average size, and even without extending them, they are a bit big for me.

Personal conclusion: For the same money, I might choose them again (I don't use them daily and for many hours). Otherwise, I would spend twice the amount for something of better quality.