Canon EOS-1D X Mark III Advanced User's Manual page 515

Available communication functions and connection methods (besides GPS)
Available Features
Camera Connect communication from
smartphones
Using EOS Utility
Image transfer to FTP servers
Using Browser Remote
Syncing time between cameras
Connection Method
Wired
LAN (Built-In)
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515
Wireless LAN
Wi-Fi (Wireless File
Transmitter
WFT-E9)
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