... Li-battery 2,Headset micrphone 3,USB/TF card 4,Mini size,Easy to take 5.FM Radio,MCU system V ... -5 New,Cheap Portable Mini Voice Amplifier with Headset Microphone Features*Mini size,easy to take*18W output power ... 3.7V/1100mAh Lithium Battery, convenient and environmental*Connect computer with USB data link, used as speaker*Built-in 3" high ...