Canon EOS 70D Instruction Manual page 17

Touch Control
You can operate wireless LAN functions by touching the screen as well.
For details, refer to "Using the Touch Screen" in the Camera Instruction
Manual.
Connecting with an Interface Cable
When [53: Wi-Fi] is set to [Enable], interface cable connection is
disabled. Set it to [Disable] to connect the interface cable.
When the camera is connected to a computer, printer, GPS receiver, or
any other devices via an interface cable, the settings for [Wi-Fi] cannot
be changed. Disconnect the interface cable and then configure settings.
Using an Eye-Fi Card
When [53: Wi-Fi] is set to [Enable], image transfer using an Eye-Fi card
is disabled.
Basic Operation and Settings
17