1. Dc 5v charging slot: use the standard mini usb micro charging cable for power charging.
2. Usb slot: it can decode and play mp3 format audio when put usb card into the slot.
3. Tf slot: it can decode and play mp3 format audio when put tf card into the slot.
4. Aux: it can play audio via 3.5mm aux cable to audio device.
5. When play music (usb card/tf card/line in/bt), press short for "play/pause". Under-------.Bt mode with mobile paired, press short to answer a call , press again to hand up. In fm mode, press short to search station automatically ,press again to stop searching )
6. Power switch: long press for "on/off".
7. Switch mode: when play music (usb card/tfcard/line in/bt),press short to switch usb/tf/fm/bt.(switch to "line in" if via aux cable to audio device).
8. When play music, press short for last song, press long to turn down the volume .
9. When play music, press short for next song , press long to turn up the volume .
Note: under fm mode,