... high-fidelity, low-power; for MP3,notebook,cellphone;last for 4 hours,with FM Main Feature:l High ... Capacity Polymer Li-ion Battery supports longer time play. Standard USB charging port. I Compact design ... Cable. It is very convenient and practical. l AUX IN for iPad/iPhone/iPod, PC, Mobile, MP3/4, etc. ... Metal case portable mini speaker FM for mobile phones,psp,mp3/mp4