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Very good product , nothing to complain, easy to use right out of the box. The only advise is that you really have to plug in as much as you can the earphones into your ear canal to avoid water getting through and having a clear sound. If you do this you can swim for hours hearing good music in all fidelity. Initially you can feel some discomfort but eventually you get used to it. Also the buttons on the device are of easy access so you can change/swtich songs easily while you are swimming or handle the volume. Excellent value for money
After some getting used to and testing in the water, if you shove the earpieces down your ear (and yes it does hurt) then they work just fine. Reasonable sound. Takes a little time to put them in correctly though. But once in they make a huge difference to the swim workout. I found myself singing along. Worth the purchase.