... THD = 10% Kaidaer MP3 Player and Miniature Speaker For IPod IPhone Micro TF KD-MN02Speaker function parametersOutput power: PMS ... (diameter 45mm) magnetically shielded, 4ohmSave /Download: USB data cable download, no external card readerPower Input : USB power adapter ... integrated digital audio player, connect your MP3.Mp4, CD, DVD, iPod, IiPhone, PSP, mobile phones, computers.Metal, circular design, ...