... MP3, MP4 1. Aluminium shell with anodic oxidation treatment, attractive outlook2. Aluminium speaker, delivery crystal music with good bass3. Ultra portable,battery operated ... save your battery life while not in use.5. Work with ipod , ipod mini, shuffle , nano, video,MP3 player, notebook ... and any audio player with a 3.5mm jack6. Power supply: DC 6 Volt( AAA ...