For most users, this mode is irrelevant. For developers and hardware hackers, it is everything. The test mode allows:
. Because it uses standard USB audio protocols, "exclusive" drivers are rarely needed for basic function, though specific tools exist for firmware updates and low-level configuration. jieli br21 driver exclusive
Many "Jieli BR21" dongles are actually USB sound cards with a Bluetooth receiver function, rather than standard Bluetooth adapters. This means they can receive audio from a phone to play through a speaker, but they cannot connect your PC to other Bluetooth devices like mice or keyboards. For most users, this mode is irrelevant
This tight integration means that devices using the setup can achieve lower latency and higher fidelity than devices using generic, third-party drivers. Conclusion For most users