No sync issues. It catches very well, through 3 walls in the apartment. We used it with an iPhone 6. I didn’t like the sound quality, but it might be tedious to set it up with an equalizer. Few points. I gave it to a girl, she didn’t want to reconfigure it, she says she likes everything. They sit a little strange in the ears. You have to flip it up. Noise isolation is excellent, there are 3 types of nozzles
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