What (e.g., Windows 11, Windows 7, Linux) are you using?
Look for a yellow exclamation mark under or Other Devices .
However, its identity is a common source of confusion. In the Linux operating system, the lsusb command identifies it as "ZhuHai JieLi Technology JieLi BR21" with the ID e5b7:0811 , or as a "Jieli Technology USB Composite Device". On Ubuntu with KDE, the packaging for a similar product is listed as a "JieLi BR17 PC Music Transmitter". Jieli Br21 Driver
Right-click the problematic BR21 device and click . Click Browse my computer for drivers .
: Connecting to phones, mice, and keyboards. What (e
: Many generic 4-to-8 channel mixers use this chip to handle the USB interface for recording or playback.
The chip supports Bluetooth 5.0, offering stable connections, low power consumption, and decent audio codecs (SBC, AAC, and sometimes custom low-latency modes). On many USB dongles bearing the BR21 chipset, Windows may not automatically install the correct , leading to limited functionality (e.g., no mic input, or audio only in "Headset" mode with terrible quality). In the Linux operating system, the lsusb command
: In Device Manager, right-click the Jieli BR21 entry and click Uninstall Device . Unplug the device, reboot your computer, and plug it back in. Windows will attempt to reinstall a fresh cache of the driver. 3. Bluetooth Audio Stuttering or Dropping Out