Loud-speaker audio amplifier 1.support TF, U-disk,USB 2.FM radio recorder 3.earphone ,Support for recording and repeat we are ... factory , Welcome you to visit our factory Micro TF Card USB ... : lithium battery / DC5V Music format: MP3, USB,TF card ,FM Concact USTechnic specification Dimension138*53mmOutput RMS5w, THD=10%Speaker ...