This is a really sweet and super handy device, very easy to use. The sound is strong enough, it is rather surprising, as many have already said. The sound quality is obviously not great, but I was expecting worse! I knew that had headphones sound much more rotten.
I do not know what to say the price, I find it odd that varies by model ... It is fairly cheap considering the design and surprising power of this small object. I would like to make a small collection (I find really great that they can be connected together!), But as there are models to 20, it will go up a little too fast ...
After receiving mine I ordered another for a gift, I think it's really good for gift ^^
Here and in general I recommend GOOD LOOK AT THE BOTTOM OF PACKAGE FOR WIRE!