... -battery 2,Headset micrphone 3,USB/TF card 4,Mini size,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 to take*18W output ... can cover 800sq.m*MP3 by TF Card, USB flash disk supported, FM Radio Function*Built-in 2pcs 3.7V/1100mAh Lithium ...