Bluetooth transmitter BC75
1. bluetooth V5.0 
2. Connect two phones
3. Synchronize the mobile phone time,  24H time display
4. BASS function
5. AUX  output 
6. Private answer 
7. Support power off memory function ,support bluetooth reconnect automatic
8. bluetooth support A2DP,AVRCP,HFP,HSP
9. Support Siri/ Google voice assistant 
10. Stereo
11. Dual fast charge: QC3.0,PD20W
12. Support input over-voltage protection, output over-current protection, output short-circuit protection and over temperature protection