The release button can be pressed halfway or all the way. Pressing it halfway activates the autofocus and sets the shutter speed and aperture settings.

Pressing it completely takes the picture.

For long exposures or continuous shooting, press the release button completely and slide it in the direction of the arrow. This locks the botton in the depressed button, silde the button back to its original position.

Shutter Cable for Nikon /N1  Shutter Cable   Compatibility :

Nikon D3, D300, D700, D22