Sony FE 100-400mm f/4.5-5.6 GM OSS Lens - Manual (Page 44)

When the pairing information for the headset has been deleted from the Bluetooth device.
When the headset is initialized.
All of the pairing information is deleted. In this case, delete the pairing information for the headset from the connected device
and then pair them again.
The headset can be paired with multiple devices, but can only play music from 1 paired device at a time.
Related Topic
Wearing the headset
How to make a wireless connection to Bluetooth devices
Connecting to a paired iPhone
Listening to music from a device via Bluetooth connection
Disconnecting Bluetooth connection (after use)
Initializing the headset to restore factory settings
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