No sync difficulties. It catches really effectively through each of the apartment's three walls. An iPhone 6 was the device that it was utilized with. I didn't care for the sound quality, but I imagine that adjusting it using an equalization would be time consuming. A couple of points. I presented it to a female, but she didn't want to change anything because, according to her, she enjoys everything as it is. They have an unnatural feel when worn in the ears. You will need to turn it over. There are three distinct types of nozzles, and the noise isolation is superb.
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