bluetooth Car Charger BC68 Manual
1. LED display 
2. MIC 
3. Click on the previous song/long press one second to switch the mode.
4. PD 18W  quick charge 
6 Mobile Music / TF / U Disk Song Mode
7 Siri Voice Assistant
8 Colorful lights function
9 Shutdown function
10.Rated working voltage 12V-24V
11.Limit working voltage 10~26V
12.Blue USB interface U disk play 1G+64G