1. They don't have L and R marks. You need to put them in your ears and turn them on at the same time, so they show "left channel" and "right channel"". . Am I ended up marking my left earbud with a metal marker but it came off pretty quickly 2. About two weeks after using it the language changed to Japanese I think my husband had to play around with them to get him to speak English return. Otherwise great headphones.
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