Sony ULT FIELD 1 Help Manual page 29

The pairing information with the speaker has been deleted from the BLUETOOTH device.
The speaker is initialized.
All pairing information will be deleted. If you initialize the speaker, it may not be able to connect your computer. In this case,
erase the pairing information of the speaker on your computer, and then perform the pairing procedure again.
The speaker can be paired with multiple devices, but can only play music from one paired device at a time.
The passkey of the speaker is "0000." If a passkey besides "0000" is set on the BLUETOOTH device, pairing cannot be done with
the speaker.
Related Topic
Listening to music of a device via a BLUETOOTH connection
Terminating the BLUETOOTH connection (After use)
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