Sony MDR-ZX770BT Help Manual page 62

The headset can be paired with multiple devices, but can only play music from one paired device at a time.
Hint
The above procedure is an example. For details, refer to the operating instructions supplied with your Android
smartphone.
To delete all pairing information, see
Related Topic
How to make a wireless connection to BLUETOOTH devices
Connecting to a paired Android smartphone
Listening to music from a device connected via BLUETOOTH
Disconnecting BLUETOOTH connection (after use)
Initializing the headset to restore factory settings
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