The Jieli BR21 is great for low-cost setups where basic Bluetooth or USB audio out is needed, but it is not a professional-grade solution for recording or low-latency work. True Plug-and-Play (Usually):
I can confirm this works with Ubuntu 22.04. Using at terminal lsusb lists as: "ID 4c4a:4155 Jieli Technology USB Composite Device" Ask Ubuntu Jieli BR21 Bluetooth dongle shown as storage device Jieli Br21 Driver
Here is where the BR21 gets tricky. Unlike open-source ESP32 solutions, the BR21 requires to change the EQ, button mappings, or LED behavior. The Jieli BR21 is great for low-cost setups