I've had them for a little while, but I am very satisfied; amazing design and the case (which is small enough to fit in my palm without being noticeable, while my friends who have other headphones found their cases uncomfortable and large to fit in their pockets). When it charges, it lasts for an hour and a half of walking (because I bought them for music); the battery only dropped to 10%. I was amazed during the conversation; I was satisfied, and even though I was speaking softly, the person I was talking to could hear me normally. Time will tell if they continue like this. I want to give some tips for beginners who will buy the product, and the instructions are only in English and Chinese, and they may not know both languages.
1. When you open the case for the first time, the left (L) will turn on automatically; the right (R) will not; you have to open it yourself.
2. The two headphones come factory-charged with 50% battery each. When they run out of charge and you put them in for a full charge, you will notice that there is a protective film on the charging contacts of the headphones that makes the contacts look blue; you need to remove it; it is not part of the design; the contacts are gold.
3. You can fully charge the case and then take it with you so you can place the headphones inside and charge them anywhere.
In summary, the headphones have good bass for music, amazing battery life, very good sound, and during conversations, along with durability over time and all the other features; if they last over time, I will definitely buy a second pair. I will return to make a supplementary review, good or bad, after some time if needed.
UPDATE
I lost the first pair and bought a second one about 9 months after purchasing my first pair; it came without the protective film and did not work. Fortunately, the very kind gentleman exchanged them for me. The other pair came with the blue film; mine fell and lost a bit of volume in the left; it was my fault.
On 13/09/2024, I bought another pair through Skroutz.gr at a good price of 13.53 and 3 euros shipping. WARNING HERE for beginners who have no experience: I received the headphones, BUT there was something different; the previous ones activated automatically when I opened the case, but they did not charge because I had to remove the protective film from the contacts as I described above. FOR THE THIRD PAIR, I opened the case, and the headphones did not activate at all because this time there was a red film. I put them back inside, and they did not charge; then I discovered that there was a second transparent film that the other two cases did not have; I am sure of that. I mention this because someone might think there were questions.
The headphones are definitely resistant to water and sweat, and they are beasts in battery life.
I will rely on the durability of the third headphones