I'd give you my review, but you've already read it on Amazon. It's a small world.

Well, let me add a couple things. It will fill a cargo pocket but, especially without batteries, it doesn't weigh much. It's not super rugged but for the price it's good. I keep one in each of my BOBs. They come with earbuds but also have an external speaker, which is kind of nice if you're sharing it. I keep mine in a zip-loc bag. Thus far, I haven't even tried batteries in them, as they give good output for your cranks.