1.CE,ROHS,ISO,FCC 2.Rechargeable,li-ion battery inside 3.MP3/USB ... (have the function like antenna). Turn on the amplifier , and adjust FM by press next and previous ... inside : you could down load song on the amplifier beforehand ,just play it whenever and wherever you ... as your requirement .lll PARAMETERSPECIFICATIONADVANTAGESITEM NO.N87 voice amplifier COMPONENTS1.CHARGER 2.HEADSET MIC.3.MAIN UNIT4. ...