Sony WH-XB900N Help Manual page 116

Help Guide
Wireless Noise Canceling Stereo Headset
WH-XB900N
One-touch connection (NFC) does not work.
Keep the smartphone close to the N-mark on the headset until the smartphone responds. If it still does not respond,
slowly move the smartphone around.
Check that the NFC function of the smartphone is turned on.
If the smartphone is in a case, remove it.
NFC reception sensitivity varies depending on the smartphone. If the connection repeatedly fails, connect/disconnect
by operating the smartphone.
You cannot establish a one-touch connection (NFC) while charging the battery, because the headset cannot be
turned on. Finish charging before establishing the one-touch connection (NFC).
You cannot establish a one-touch connection (NFC) when the headphone cable is connected to the headphone cable
input jack. Remove the headphone cable before establishing the one-touch connection (NFC).
Check that the connecting device supports the NFC function.
Check that the Bluetooth function of the smartphone is turned on.
Related Topic
One-touch connection (NFC) with an Android smartphone
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