I've received your product. The delivery was really fast!
But it looks like something wrong with the earphones. The sound is good, but after ~5mins of usage the earphones starting to lose the signal. One after another. So frequently, that it is impossible to use them at all.
In the description is written, that it should work on standard for bluetooth distance of 10m. But in my case the distance was less than 50cm and there was already issues with connection.
I've tested earphones with my phone (bluetooth 5.0) and laptop (bluetooth 2.1). In both cases I experiencing the same problems.