remote switch with all functions of the camera's shutter release button.
Particularly important to avoid camera moving, making it convenient and
easy to use when taking long exposure photos.
Half press on the shutter button will cause
the camera to focus, full press will trigger the shutter and cause the
camera to take a photo. For long exposures, press the release button
completely and slide it in the direction of the arrow to lock the button
in the depressed position. To unlock the button, slide it back to its