Yamaha Corporation HPHW300A Manuel D’Utilisation

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Operating the connected Bluetooth device by voice commands
If the connected Bluetooth device has a voice control feature/app (Siri, etc.), you can control 
the Bluetooth device from the headphones.
Tap the center of the right housing twice briefly.
Voice control (Siri, etc.) starts and the Bluetooth device can be oper-
ated by voice commands.
Note
This works only for devices that have Siri or another voice control 
feature.