To benchmark products and market tested, Philips (pro sound originally) offers a quality product. Its clean, clear and powerful, both on the bass, treble, on its scope in terms of the size of the chain. Aesthetics and solid. Bought for my 8 year old son he delights! It is easy to use, responsive and complete! Attention, all USB keys are not recognized, and whether to use one, ensure that your MP3 songs are stored directly on the key without the filter of a "dossier". Musically yours.