iWorld Sonic Docking System (Pink) Works with all iPhone/iPod models, smartphones and mp3 players Standard 3.5mm input plug links to any audio source with a standard 3.5mm output connection Powered by 3 AA batteries (not included) or by DC 5V AC adapter (not included) Amplified speakers deliver a full spectrum of sound with crisp highs, smooth midrange and a rich low and enhanced by Dynamic Bass Response