In JL’s SDK (e.g., "AC695N_sdk", "AC692_sdk"), the SPP driver is part of the Bluetooth stack.

: Sending non-audio data, like battery levels or configuration settings, to a mobile app or PC software. Diagnostic Tools : Used by manufacturers during the quality control process. Why is it showing as an "Unknown Device"? In many cases, Windows will list

Windows sometimes fails to automatically map this specific hardware ID to its internal "Standard Serial over Bluetooth link" driver, leaving it marked as an "Unknown Device" or "JL-SPP". How to Resolve Driver Errors