... ,Easy to take 5.FM Radio,MCU system V-5 Audio mini voice portable amplifier with USB/TF and FM radio Features*Mini size,easy ... 800sq.m*MP3 by TF Card, USB flash disk supported, FM Radio Function*Built-in 2pcs 3.7V/1100mAh Lithium Battery, convenient ... Applications Teaching, Tour guiding, Morning exercise, Training, Sports, Speech,Publication,Outdoor entertainment