These specific headphones have a manufacturing defect. The company has limited the "amount" of data that the headphones can handle, resulting in the sound they produce being compressed and distorted when their microphone is activated.
More specifically, whenever the microphone of the headphones is in use (e.g., during an online call on the computer), because the headphones must manage both the audio data that is "playing" from their speakers and the voice data they are recording from the microphone, they inevitably compress the sound that passes through to their speakers, and it sounds compressed and "muffled." When the microphone stops being active, the sound returns to normal and sounds clear and natural.
Most people cannot perceive this specific problem, as they only use them for online calls and meetings; however, if you try to listen to music while on a call, you immediately notice it. Therefore, if you intend to use the headphones with programs like Discord, or if you want to listen to music while simultaneously chatting with someone, then these headphones are unsuitable.
I give them only 1 star because this design flaw that the manufacturer deliberately "hides" makes the headphones almost unsuitable for anyone who wants to listen to music and chat with someone else at the same time, while there are other headphones designed for online calls that are also cheaper and do not have this problem.
On the positive side, for the 3 days I used them, they are very comfortable to wear and do not cause fatigue at all after several hours of use. Also, they are plastic and relatively lightweight, but they do not look cheap and ready to break. However, in this category, there are other options with less money and without the very significant problem I mentioned.

You can read more about this specific problem on the official subreddit of the company Jabra:
https://www.reddit.com/r/Jabra/comments/1ducuox/is_there_a_way_to_disable_call_mode/
https://www.reddit.com/r/Jabra/comments/inkzni/jabra_evolve_20_audio_quality_change_app_dependant/

I used them for professional purposes because I was constantly talking to the computer and they didn't let me down at all in terms of sound or microphone

Another world! It had been a while since I realized that such a level of soundproofing exists specifically only in the microphone. Kids are shouting in the next room, my phone is ringing loudly next to me, and nothing gets through. Just when I was thinking about how to improve the online classes I deliver, because I had to confine my family to half the house due to noise, the solution came, and it’s economical too! I highly recommend it to anyone facing similar problems without simultaneously isolating in the headphones and losing touch with the rest of the house.

Very good headphones. Lightweight and not tiring (up to 8 hours of work), the sound produced by the microphone on the other end is great and cuts off surrounding noises. It doesn't have amazing sound isolation, but you don't buy them for that reason anyway. A very good and reliable choice. The only negative was that they were sent to me in a simple bag instead of having their own packaging like most headphones, such as a company bag for transportation or storage.

These headphones compared to anything else on the market are really good! They are lightweight, simple construction, good microphone, clear sound (although they don't capture high frequencies, so the sound is quite bass). After 8 hours of continuous work, they don't tire you. They don't have good sound insulation, but I don't consider this a disadvantage because when you are in the office at work, you want to hear what's going on around you (or at home, you want to hear the delivery guy :P).

I had them for 1.5 years of daily use and they didn't suffer any damage, even from the times they fell down.

Very good in terms of sound performance, but tiring as an application on the ears. After 8 hours of use due to work, the outer ears hurt.

Lightweight and comfortable headphones with satisfactory sound quality and microphone. The controller on the cable is large and heavy.