I originally bought this for use on my net book as the inbuilt speaker was sub par.
It works brilliantly on my net book very loud and very clear this is a lot better than those larger speaker sets which use disposable battery's that I've used in the past.
It's size is minuscule it's smaller than the palm of my hand and fits neatly in my pocket but when it's in use it's volume is ridiculously high, the clarity holds out to high volumes and doesn't distort at all.
As a test I plugged it into my mp3 player and was impressed again by it's clarity and volume, it fills a room with sound even above people talking.
Originally I was going to buy one of these and if it wasn't loud enough I'd buy 2 and use an audio splitter but now I don't need to, it's amazingly loud for something so small. highly recommended a truly innovative little product.