1,Rechargable Li-battery 2,Headset micrphone 3,USB/TF card ,FM Radio 4,Mini size,Easy to take 5.Reverb /Echo function ... V-3 Mini size big power waistband teaching tour guide ... flash disk supported, FM Radio Function*Built-in 2pcs 3.7V/1100mAh Lithium Battery, convenient and environmental*Connect computer with USB data ...