Use only for running, they fit well in the ear and do not fall out, strong music and bass, after a little use it suddenly stopped charging the right one

Owner here for 5 months..
If you want to "fill" your ears with sound, then you download and install the application that supports them and adjust their equalizer, update the firmware, and generally have control over their status.. at this price (20€) they may be the only ones that give you such capability, the competition just gives you a pair of headphones and says "listen", and that's it..
The application in the ear is not the best, but okay, they are not tiring..
The only negative thing they have is the range... up to 6-7 meters in a straight line, and if there is a wall in between, "the end"... after contacting the company, they informed me that several batches were faulty..

"Should I get them?" If you forget your phone left and right, then no.. if you carry it with you, then yes...

Judging the remaining reviews as incomplete, I must dedicate an extensive review to these headphones:

POSITIVES:
- Large battery in the case: With 2-3 hours of daily use, I charge the case about once a week.
- Sufficient battery life in the headphones: I don't know how many hours they last, but I can't believe anyone would use them for more than 6 hours.
- Awesome noise isolation: Due to their shape, they fit perfectly in my ear, effectively isolating noise of various decibels.
- Negligible sound leakage: Even at maximum volume, someone would have to stand next to me and listen carefully to hear sound from the headphones.
- Excellent stability: The rubber components ensure that the headphones stay in the ear regardless of the situation and vibrations (mountain biking, running, etc.).
- Easy pairing: They connect instantly with each other and with your device.
- Decent stereo sound: For their price, the headphones have nice surround sound, which is important for games and movies.
- Durability: After several medium-height falls, they remained intact.
- Volume: I never use them at 100%, and given that I like loud sound, their maximum volume is more than enough.
- User-friendly: Through the QCY app, you can easily customize the function of the clicks and adjust the sound with a simple equalizer.

NEUTRALS:
- Sound: Being a demanding music lover, the headphones didn't surprise me. The bass is present and sweet, but the mid and high bass are hard to find. The mid frequencies left me indifferent and somewhat muddy, so don't expect to hear details and multi-layered sound in your favorite songs. Similarly, the highs, with the high hats not being enjoyable. Overall, their sound leans towards the bright side, a characteristic common in cheap headphones.
- Appearance: Although lightweight, they are bulky, so they are not the most aesthetically pleasing.
- Buttons: They seem cheap, are somewhat noisy, and can be uncomfortable when pressed against the ear.
- Around 30% volume, the intensity changes abruptly, making it awkward to handle the sound at that point.

NEGATIVES:
- Latency: They are not suitable for gaming, and gaming headphone users will notice slight latency even in videos. However, this doesn't matter for music.
- Comfort: After some time, the rubber tips become uncomfortable for the ears, and overall, the headphones are not recommended for prolonged use. If worn with the tips outside the ear, they are noticeably more comfortable, but stability is significantly reduced.
- Microphone: It is practically useless unless you are in a quiet room. Even then, you need both headphones in your ears.
- They produce a continuous, imperceptible but annoying sound. It resembles a light buzzing from the electronic parts, which disappears when sound is playing. (Perhaps mine are defective)
- Range: Especially if there is a wall in between, don't expect more than 5m.

I recommend these headphones as a second pair for sports activities. For their price, I believe there is nothing better.