It was very good. for 2 weeks. Then the right side stopped working. Based on other reviews I would say they are defective. I've only used them 4 times for running and a few times while cleaning the house. The sound was great until they broke. I agree with others too - the weight distribution was a bit odd and every time I leaned forward or turned my head to the left, one of the earbuds would detach and start falling out. All in all a huge waste of money.
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