Hmm....bummer. Well, you just need to know it can be used in the water. Um....A shame you can't dance in the water or it would be VERY helpful....

But if that's your guess for the item, nope. But maybe it's the name of the the strap thingies around it?

I had missed your edit. I might be. 
Has nothing to do with synchronized swimming, really. Um....Here's a HUGE hint. It requires headphones.

It's a waterproof mp3 player.
And the headphones are waterproof, too.
Your turn.

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