Sony WH-CH400 Help Manual page 85

Help Guide
Wireless Stereo Headset
WH-CH400
One-touch connection (NFC) does nor work
Check that the NFC function of the smartphone is set to 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 make a one-touch connection (NFC) while charging the battery because the headset cannot be turned
on. Finish charging first, and then make the one-touch connection (NFC).
Related Topic
One-touch connection (NFC) with a smartphone (Android 4.1 or later)
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