Manual of bluetooth car charger BC67
1. Voltage and current display digital tube
2. Short press to switch color,Long press for led breath mode 
3. The previous song / FM channel -
4. Digital LED Display
5. Colorful lampshade
6. Short press BT/TF/USB switch/long press to enter FM mode)
7. Next song / FM channel +
8. MIC
9. Play/Pause/Hansfree/Redail/Long press to enter SIRI/Left and right rotation for Vol+/-
10. PD3.0 output