A: There may be multiple reasons for the inability to recognize; you can try the following methods to resolve it:

1. Try unplugging and re-plugging the receiver, connecting it both ways to avoid poor contact that may cause recognition issues.

2. Uninstall and reinstall the HollyAudio APP to ensure that the APP version is the latest, V2.5.7;

3. Try changing the phone connection to avoid issues with the cable that may prevent recognition.

4. If connecting to an iPhone, go to the phone settings, find'General'→ 'About', and check if there is a driver for 'wireless microphone'; if not, it indicates that the cable certification is missing and needs to be replaced.