HD Dock Music System for iPod/iPhone More natural-sounding bass and percussion instruments thanks to advanced iPP waveguide speaker technology and a newly designed 5-in. woofer Auxiliary input to enjoy MP3 player, DVD player or TV sound through the system Charges docked iPod/iPhone, even while its playing, as long as system is plugged in Remote control operates power, volume, track seek and iPod playlists Bass Control let owner to set desired bass level