Sony MDR-XB50BS Help Manual page 59

If [MDR-XB50BS] does not appear on the display, try again from step 3.
* A Passkey may be called a "Passcode," a "PIN code," or a "Password."
Note
If pairing is not established within about 5 minutes, pairing mode will be canceled and the headset will turn off. In this case, start over from step 1.
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 headset is already paired with 8 devices and another device is to be paired.
The headset can be paired with up to 8 devices. If a new device is paired after 8 devices are already paired, the paired device with the oldest
connection time is replaced by the new one.
When the pairing information for the headset has been deleted from the BLUETOOTH device.
When the headset is initialized, all pairing information is deleted.
In this case, delete the pairing information of the headset from the BLUETOOTH device, and then pair them again.
The headset can be paired with multiple devices, but can only play music from one paired device at a time.
Hint
The above procedure is an example. For details, refer to the operating instructions supplied with your computer.
To delete all pairing information, see
Related Topic
How to make a wireless connection to BLUETOOTH devices
Connecting to a paired computer (Windows Vista)
Listening to music from a device connected via BLUETOOTH
Disconnecting BLUETOOTH connection (after use)
Initializing the headset to restore factory settings
4-595-529-11(1) Copyright 2016 Sony Corporation
"Initializing the headset to restore factory settings."
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