Sony MDR-MV1 Open-Back Reference Monitor Headphones - Manual (Page 108)

Note
Connection is not guaranteed with the USB ports of TVs, etc.
If the volume is turned down on the connected device while connected via Bluetooth connection, the volume will not increase
much by operating the headset. When this is the case, adjust the volume by operating the connected device.
Related Topic
How to make a wireless connection to Bluetooth devices
Listening to music from a device via Bluetooth connection
Resetting the headset
Initializing the headset to restore factory settings
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