I have changed many Bluetooth headphones, this is by far the best I had. You hear your interlocutor perfectly and they can hear you, while also isolating external noises. I highly recommend it.

Strong sound... the speaker hears me clearly. It doesn't disconnect... and the Bluetooth range is about 3 to 4 meters, after that it starts to have some minor issues... as for the durability of the construction... it's worth 5 euros... I don't know about it, but if it breaks, I'll get another one

For the money, it's very good! It has clear sound and they also hear me very well, as they tell me. The battery lasts several hours, although I haven't checked how many.

edit 23/9/2023
Still playing very well, never disconnects and the battery lasts for many hours. Super!

Great surprise for its price! I sound and hear very clearly, in fact, I usually lower the volume. The battery is very large, I forget to charge it. The device was recognized immediately. I couldn't believe it would be so good for its price! The only negative is that it doesn't have a long range, the sound is lost at 4-5 meters, so you can't wear it, for example, at home and take walks, you have to have your mobile phone with you.

I bought it on 20-1-2022. It stopped working on 30-9-2022 because I put it in the washing machine. It had fallen repeatedly on the floor - sometimes the cover had opened, but it snapped back on just fine - it had also been partially soaked several times, and once it fell into a bucket of yogurt and after cleaning, it worked PERFECTLY!
So, durability is not even up for discussion, it's a beast! Its battery had a slight decrease in performance, around 15%.
Its application was good, as I used it to listen to podcasts or talk on the phone sometimes, and the sound was decent enough. Sometimes there were complaints from those I was talking to that they could hear the surrounding noises loudly. I highly recommend it for its durability alone and for small sound quality demands, in fact, I just reordered it.

One week of operation so far. Simply flawless.. connected simultaneously to 2 personal and professional devices with several phones, 8 hours of operation every day comfortably last 2 days. I can hear and be heard perfectly clear. No disconnections so far and the purchase price is €6.60 final. I bought another 2 just to have them. Due to my profession, I have already changed 3 Bluetooth devices from different companies and I always chose those with the hook, with 2-3 times the price, they couldn't last more than a month.

For the money I paid (6.90 ‎€), it's very good.
+ Very stylish and comfortable.
- The battery lasts barely a day without talking much on the phone.