1.Aluminum speaker 2.FM radio 3.Built-in Li-battery 4.TF and USB 2011 new USB radio speakerSpeaker boxIcon and function explanation:New mini aluminum vibration film loud speaker,which has clear alt and pure woof, The unique design makes tone performance.Metal,shell shows noble and fashionable,out of ordinary,with many colours,several solution:for your option.This compact travel speaker system is ...