Infrared shutter release
In addition to the shutter the button, Canon DSLRS can be fired remotely, either with an infrared remote that triggers this sensor on the front of the camera, or via a cable that plugs into a port on the side.
In addition to the shutter the button, Canon DSLRS can be fired remotely, either with an infrared remote that triggers this sensor on the front of the camera, or via a cable that plugs into a port on the side.