As an indication of battery life, during the first month of purchase, they lasted me 4 hours plus something, playing music continuously while running the marathon. Therefore, tested even in heavy sweat...

The sound is very good for the money, the fit is comfortable and it includes 3 different sets of ear cushions, and finally the battery is excellent (I forget to charge them). For calls, it doesn't work well, the microphone picks up everything around.
The main issue is that I have bought this product twice, and both times the left earbud malfunctioned. Specifically, for some unknown reason, it suddenly started to have very low volume even at the maximum volume setting on the phone. The second time I bought them, it happened within 2 months, so overall a bad purchase.

Excellent sound, good fit. The mechanical pressure of the keys is a bit difficult, but overall they are significantly better than the others I have tried (xiaomi-edifier-taotronics) in this category. The battery and range are simply good, but not outstanding. I am returning because after 1 month the right earphone has decreased in volume, without any justification.