Canon EOS 70D Instruction Manual page 185

Remote
control
sensor
Fluorescent or LED lighting may cause camera misoperation by
triggering the shutter inadvertently. Try to keep the camera away from
such light sources.
If you point a remote controller for a TV set toward the camera and
operate it, it may cause camera misoperation by triggering the shutter
inadvertently.
Remote control shooting is also possible with devices such as an EX-series
Speedlite equipped with a remote-release function.
4
Select the self-timer.
Look at the LCD panel and turn the
<6> dial to select <Q> or <k>.
5 Press the remote controller's
transmit button.
Point the remote controller toward the
camera's remote control sensor and
press the transmit button.
The self-timer lamp lights up and the
picture is taken.
R Remote Control Shooting
185