It sounds like a mini orchestra noise. Crocs are so comfortable. They are well made and I believe they will last a while. An orange LED illuminated on the right earpiece to let me know that they were charging and it took a couple of hours for this to go out, indicating that they were good to go. The lid is separate so not an ideal design. I actually prefer this feel than the heavy premium feel of the 4. I?d forgotten to write a review. I have normal-slightly-wide feet, 22-23cm long. At twice the price, Id be pleased; priced where they are. Another thing which I do not understand is LIVE mode.