It uses a standard USB audio class driver built into Windows. However, if you want low-latency playback (Fast Stream) or advanced Bluetooth codec control, you may need to hunt down a vendor-specific driver—which is poorly supported.
Jieli does not provide official signed drivers for Windows 10 on their website. Instead: jieli br21 driver windows 10
If the generic audio driver didn't work, you may need the specific JieLi driver. This is typically used for firmware updates or if the device is acting purely as a Bluetooth Transmitter. It uses a standard USB audio class driver built into Windows