This is the All-In-One Bluetooth 5.0 Audio Module. It includes (besides the standard BT Audio Receiver with Headphone Output) an FM Radio, a Memory Card Slot for MP3, and a Microphone to use as hands-free.
It operates on 3.7 to 5V power supply.
A short wire as FM antenna is included.
We currently don’t have any documentation available, but it is very easy to find out how it works. We will add more information as soon as it becomes available.