Sony LinkBuds S YY2950 Reference Manual page 56

Select [Bluetooth].
4.
Select [LinkBuds S], then select [Pair].
5.
If Passkey (*) input is required, input "0000".
The headset and computer are paired and connected with each other.
When the headset is placed in the charging case, the indicator (blue) on the charging case flashes slowly for about
5 seconds.
When you are wearing the headset, you will hear a notification sound from both headset units at the same time.
If they are not connected, see
If [LinkBuds S] does not appear on the computer screen, try again from the beginning of step
* A Passkey may be called "Passcode", "PIN code", "PIN number", or "Password".
"Connecting to a paired computer (Windows
53
8.1)".
.