... card 3,LED Display 4,Mini size,Easy to take 5.FM Radio,MCU system Waistband Portable Voice Amplifier with Headphone ... .7V/1100mAh Lithium Battery, convenient and environmental*Connect computer with USB data link, used as speaker*Built-in 3" ... , Tour guiding, Morning exercise, Training, Sports, Speech,Publication,Outdoor entertainment Mini Size Rechargeable Portable Voice Amplifier with LED display V-5