I highly suggest these shoes to anyone questioning their decision. Most likely utter bunk. Only reason I give it 4 stars is because it?s missing some of the fur on the sole and I can see white spots! Sound is clear and microphone works well too. These are pretty forgiving of poorly recorded music, this rely more on a fun sound rather than analytical. Die eigentlichen Ohrhörer sind in einer kleinen Schatulle, die auch gleichzeitig die Funktion der Ladestation für die Ohrhörer übernimmt, wertig verstaut. I have tried to re-calibrate the device several times and that has not worked. Completely waterproof. I originally bought these to use as a temporary solution, but I love them so much, I dont anticipate replacing them ever. Believe the other reviews.