... display, smart card reader, support mp3/USB SD/MMC, remote control, can be used in audio, speaker, amplifier, home theatre system, and so ... volume-Application: Ordinary audio combination, Car audio, multimedia speaker, subwoofer, amplifier, electronic products and so on.-Key function: last songs, next ... open the molde for customer. Our Trade Manager ID:czshuwei sd usb fm mp3 pcb board