excellent product, could easily get the 5th star
It is easy to use, the battery life is sufficient and the headphones fit well in the ears during exercise (long-distance running). The sound quality is optimal.
I don't have enough experience to give an opinion on the product's resistance to rain and the durability of the plastics over time.
Room for improvement :
The instructions and the APP are in English.
The ability to pair two different devices and switch between them in the APP with a button would be a plus.