I've been carrying it on my keys for a couple of weeks now so I tested it a bit. He keeps up very well in the group, I'm constantly on the move and haven't had any problems. I hardly even notice it half the time, which is great too. It muffles the sound a little, but with any such protective cover it will be - additional protection from sound. However, it's not too bad and didn't significantly limit functionality for me. But if you're hard of hearing, it can be a deal breaker. In general, at this price it is not a problem!
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