The first pair went bad for the first few hours. I could hear music (by the way, the sound quality is quite good for such a price), but the participants didn't hear me on their side. At first I thought it was a bluetooth issue but after troubleshooting it turned out to be a defective product. I sent the defective one back and got a new one. I will follow the update in the future. Happy with the replacement so far. The product is light and comfortable. I went with the reds who got positive compliments from others. The voice quality over the interchangeable headphones seems to be good. I haven't tried them in noisy environments yet to test background noise cancellation. I am concerned about the build quality specifically advertised as to whether they will actually withstand and resist water. For $19 I shouldn't be expecting much but I do expect the product to work as advertised. We will see. FYI, the pairing instructions on Revain are different than the instructions that came with the product.
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