... LED display -support SD / USB Card Reader,FM radio,LED display -MP3 decoder,pcb assembly -DC 5.0V,IN -power on/off Pcb with LED display ... :MP3/SD/USB Card reader, fm radio and digital screen display, with power on/off bu remote control, and so on ... and so on.-Key function: last songs, next songs, volume control, Play/pause, repeatProduct No.: SW-921Technical parameters:FeaturesControl ProvidedLED, ...