Whats odd is it worked initially with my Switch but then stopped working. I do believe they are authentic - I saw one reviewer noted that the lettering on the footbed is black not gold, however, I went to Birkenstocks website directly and they show this exact same sandal with black lettering. I bought a nice light for my bike. I will remember Panasonic everytime i do so. I use these on a Fender amp for guitar practice and they work and sound great. He tenido otras sandalias de este tipo, no sé si depende del material o de la suficiente amplitud de las tiras que sostienen el pie, pero no me han causado problemas como estas. It’s hard to find this kind of simple jewelry in an actual store. Yes, it does have a lot of functions that many of the high end priced speakers dont at all have. to much justification for actions taken. So I leave my glasses off, or balance them inelegantly on top of the earpads.