I bought these headphones without knowing their features, but so far they have exceeded my expectations. Of course, I was aware of the quality category as I bought them based on their low price. So:

Fit and comfort: After using them, I consider the headphones to be very convenient and comfortable, as they do not cause fatigue after prolonged use and are lightweight and snug.

Calls and microphone: Personally, I do not make calls through Bluetooth devices (I bought them exclusively for music and video playback), but after just one conversation, I realized that they are not suitable for people who may use them for this purpose.

Music and volume: Although there is a noticeable difference compared to wired headphones worth €15, I believe that their performance is very satisfactory and I have no problems with the sound quality, which pleasantly surprised me.

Packaging and charging case: In the box, along with the headphones, there is a short charging cable, which is worth mentioning that it is iOS (the case has an iOS port). Specifically, the case seems to be a cheap construction without magnets like others, but it is still convenient, small, and functional. Additionally, unintentionally, it passed a drop test, in which it excelled as it did not suffer any damage.

Connectivity: The first time, the connection to the mobile phone is done through the settings. The next times, they usually connect on their own, but sometimes only one may connect and you may need to disconnect and reconnect them.

Frequency of disconnection: After reading the instructions, my life became a little easier, as they advise you not to be near a router during use, which from experience I can tell you means less than a meter, and that it would be good if there are no obstacles, such as walls, between them. The operating distance is normal at 10-25 meters, as stated, which definitely does not apply, but I have no problems due to distance. Disconnections are now reduced and minimal for me.

Battery life: Personally, I have not encountered any problems so far because I do not use them for more than an hour each time. However, I believe that the battery is not one of the strongest features of the product and it could have a longer duration. Of course, they charge as long as you have them in the case.

Observations and comments:

The headphones, in appearance, really resemble the AirPods, which they try to imitate, but they have lights that illuminate during charging and connection. Otherwise, they are off and not visible.

The headphones have touch controls, so with a touch, you can play/pause, skip a song, accept calls, decrease/increase volume, and turn them on/off.

Each headphone can be used separately, meaning the first one can be connected to one mobile phone and the second one to another.

Conclusion and price: Having used the headphones for a period of time, I think that the quality meets and exceeds the price, but there are some annoyances that affect the experience. I hope I was thorough and helped those interested.

P.S. I am still using them.

I received them terribly! I open the device, everything seems fine, and suddenly I press the button repeatedly on the left earphone and it doesn't work! I decide to charge it, maybe it doesn't have enough battery. Four hours later, only one of them turns on, unfortunately, the left one that doesn't work. The only good thing is that it doesn't have cables to annoy you. The battery is very poor, within 20-30 minutes it's dead! I'm thinking of calling to have them replaced because it's not right to pay for something and receive it broken. If you want both, don't get them at all, for sure one of them will be damaged. Also, I forgot something very important... They connect very easily, and that's good! As soon as I take them out of the box, I turn them on, open Bluetooth, and immediately they connect. This only happens with one earphone since the other one doesn't work! Anyway, I have seen everywhere that they come like this, not working properly, and that's why I gave them 2 stars! I had bought them before and I was very, very disappointed! None of them worked, I called and they said there's nothing they can do! They took my money

Kids, you get what you pay for. Law.
For their price, I don't have any particular complaints. Firstly, they are comfortable in the ears. They don't tire or fall out. The case is not magnetic, neither the lid nor the headphones lock inside like the airpods. Also, when you try to take them out of the case, they get stuck a bit on the lid. They don't come out easily. The sound is good for movies-videos or relaxed music without much bass. Unfortunately, it doesn't have much bass, so at high volume, the sound is a bit shrill in music with strong bass. Depending on the song, of course. Speaking of volume, I would say it is relatively low on the road or in a noisy environment. As for the connection, it doesn't happen automatically, at least for me. The connection is generally problematic. I don't know if it's my phone's fault (Leeco Le Max2), but they don't connect automatically when I take them out of the case. I have to press the pairing button for them to connect (each headphone separately), while sometimes they don't connect directly, I have to do it manually from the Bluetooth settings on my phone by selecting the headphones. Other times, one of the two doesn't connect, sometimes neither. That is, they are visible but they don't connect on their own. Especially if you want to connect only the right headphone, unfortunately, it can't be done. The left one seems to work better. Sometimes, even though I have them in the case, the left headphone remains connected. The battery is decent for music, but it runs out too quickly during a call. Simply insufficient. As for the synchronization of the sound between the headphones, it's fine. Rarely, there may be a slight delay like an echo between them when starting a video, for example, but pressing pause and play again fixes it. Finally, let me talk about the quality of the headphone during a call. Their sound is clear but low. You can comfortably talk at home, but outside on the street, you may not hear your interlocutor very well. However, you can still hear them!
For the 15 euros I bought them, they are good if you want to feel like you have airpods and experience having wireless headphones for a while. However, you soon realize that they are not sufficient (especially for calls), so for 20 euros, you can get Bluetooth headphones with a cable (which still gives you relative freedom compared to traditional wired headphones) and much better sound quality and isolation compared to this airpods imitation.
Guys, the truth is that with 15-20-30 euros, there are no really good wireless headphones. So either save up for something better or get Bluetooth headphones with a cable between them. These headphones are fine, but for home use and relaxed use. They don't isolate the surrounding sound with the outside noise. That's all!