... 4.FM radio,USB/TF 5.MCU intelligent Mini Personal Voice Amplifier with USB/TF and FM function V-6* ... , USB flash disk supported, FM Radio Function*Built-in 2pcs 3.7V 2200mAh Lithium Battery,full charged 4 ... up to 20hours*Connect computer with USB data link, used as speaker*Built-in 3"high power speaker, high ... cable x 1pc*Hanging belt x 1pc Mini Personal Voice Amplifier with USB/TF and FM function V-6