Info
product url - CSRA64215 Bluetooth Audio Module, BT4.2
Board Map, Dimension, Pins, chip info, Use Guide, Setup Jumper, etc.
https://w.electrodragon.com/w/CSRA64215
https://www.electrodragon.com/w/Category:BT_Audio
Applications, category, tags, etc.
Demo Code and Video
ref
legacy wiki page