Sony WH-XB900N Help Manual page 30

Help Guide
Wireless Noise Canceling Stereo Headset
WH-XB900N
Disconnecting the Android smartphone with one-touch (NFC)
You can disconnect the headset from the connected smartphone by touching the headset with it.
Unlock the screen of the smartphone if it is locked.
1
Touch the headset with the smartphone.
2
Touch the smartphone to the N-Mark on the headset. You will hear a voice guidance "Bluetooth disconnected".
Note
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
voice guidance "Power off", the indicator (blue) 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.
http://rd1.sony.net/help/mdr/hpc/h_zz/
button for about 2 seconds to turn off the power before that time. You will hear a
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