Sony SRS-NS7 Help Manual page 39

The neckband speaker can be paired with up to 8 BLUETOOTH devices. When a new device is paired in addition to 8 paired
devices, the pairing information of the earliest device connected via a BLUETOOTH connection is replaced by the information
of the new one.
The pairing information of the neckband speaker has been deleted from the paired BLUETOOTH device.
The neckband speaker is initialized.
The pairing information of all BLUETOOTH devices except for the transmitter is deleted. Once the neckband speaker is
initialized, it may fail to establish a BLUETOOTH connection with the Android smartphone or iPhone. In such a case, delete the
pairing information of the neckband speaker from the Android smartphone or iPhone, and then pair the neckband speaker with
the Android smartphone or iPhone all over again.
The neckband speaker can be paired with multiple devices, but can only play music from one paired device at a time.
Related Topic
Listening to music of a device via BLUETOOTH connection
Terminating the BLUETOOTH connection (After use)
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