... speaker B. USB/SD decoder C. built-in battery D. Wireless microphone Rechargeable trolley speaker with USB/SD, built-in battery, wireless microphone 1. Power (RMS ... . guitar input5. dynamic LED display6. Wireless microphone (1 pc)7. built-in battery (12V 7AH)8. support DC 12V power supply 9. movable ... box: 285*215*485mm rechargeable trolley speaker with USB/SD, built-in battery, wireless microphone