Disconnecting the Android smartphone with one-touch (NFC)
You can disconnect the headset from the connected smartphone by touching the headset with it.
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Unlock the screen of the smartphone if it is locked.
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Touch the headset with the smartphone.
Touch the smartphone to the N-Mark on the headset. You will hear a voice guidance “Bluetooth disconnected”.
Note
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Under the settings at the time of purchase, if no operations are performed for about 5 minutes after disconnecting, the headset automatically turns off. Press and hold the button for about 2 seconds to turn off the power before that time. You will hear a voice guidance “Power off”, the blue indicator turns off, and the headset powers off.
The time when the power turns off can be changed in the “Sony | Headphones Connect” app. For more details, refer to the "Sony | Headphones Connect" app help guide.
https://rd1.sony.net/help/mdr/hpc/h_zz/