Perfect delivery, on time, sound packages. These speakers are super nice. The sound is very good for the use that I have: MP3 playback and DivX (so very average audio quality formats) Bluetooth. Bass very good. The volume does not rise very high but enough to use in my apartment of + - 100sqm The ability to place batteries or AC is an undeniable asset, I walk my small chamber between the shower room and office! Very satisfied with my purchase.