Nikon D7200 body - Manual (Page 286)

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Enable wireless security.
Select Settings. A confirmation dialog will be displayed;
select OK.
The smart device will prompt you for this password the next
time you connect to the camera via Wi-Fi.
D
Wi-Fi
Read the warnings on pages xx to xxii before using the Wi-Fi function.
To disable Wi-Fi in settings in which its use is prohibited, select Wi-Fi >
Network connection > Disable in the camera setup menu. Note that
Eye-Fi cards can not be used while Wi-Fi is enabled and that the
standby timer will not turn off while the Wireless Mobile Utility app on
the smart device is communicating with the camera. If no data are
exchanged for about 5 minutes, the standby timer will turn off. The
camera Wi-Fi function is only available when a memory card is inserted
and can not be used when a USB or HDMI cable is connected. To
prevent loss of power while connected, charge the battery before
enabling the network connection.