These headphones are cheap and I'm surprised how good they are. The sound is good, they sit well in the ears. I used to have Galaxy headphones as they were the only ones that fit, but they do the job well. There is no master or slave button, each can work independently. A word of advice: be sure to remove the plastic wrap from the earbuds' charging contacts and allow them to charge a little before pairing. No, and it took me a while to figure out that the unpaired headphones weren't charging. Fixed it and both work great.
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