Sony WH-1000XM2/B Help Manual page 49

If the computer was connected with the headset the last time, an HFP/HSP connection is made when you turn on the headset.
While the headset is on, you can make an A2DP connection (music playback) by double-tapping the center of the touch sensor
control panel lightly (about 0.4-second interval).
Note
If the sound quality for music playback is low, make sure that the function that supports music playback connections (A2DP) is
available on your computer. For details, refer to the operating instructions supplied with your computer.
If the last-connected BLUETOOTH device is put near the headset, the headset may connect automatically to the device by simply
turning on the headset. In this case, deactivate the BLUETOOTH function on the BLUETOOTH device or turn off the power.
If you cannot connect your computer to the headset, deactivate pairing on your computer and perform pairing again. For details,
refer to the operating instructions supplied with your computer.
Related Topic
How to make a wireless connection to BLUETOOTH devices
Pairing and connecting with a computer (Windows 10)
Listening to music from a device via BLUETOOTH connection
Disconnecting BLUETOOTH connection (after use)
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