Metal case portable mini speaker FM, 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 , vibration speaker, High quality, amazing sound.l High-tech intelligent double decoding, supports MP3/WMA format music. l Can read MICRO SD directly when link ...