Sony SRS-X88 Help Manual page 278

touching NFC-compatible devices together (i.e., at the N-Mark symbol or location designated on each device).
Note
Once BLUETOOTH devices are paired, there is no need to pair them again, except in the following cases:
Pairing information has been deleted after repair, etc.
The speaker is already paired with 9 devices and another device is to be paired.
The speaker can be paired with up to 9 devices. If a new device is paired after 9 devices are already paired, the paired
device with the oldest connection time is replaced by the new one.
The pairing information with the speaker has been deleted from the BLUETOOTH device.
When the speaker is initialized, all pairing information is deleted.
If you reset network settings of your iPhone/iPad/iPod, the speaker may not be able to connect to it. 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.
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