"1) Firstly, insert the plug into the camera"s remote control socket, and turn on the camera. 2) The release button can be pressed half way and completely. Press it half way to activate the autofocus and set the shutter speed. 3) Press it completely to shoot. 4) For long exposure (camera should be set in Bulb Mode), press the button completely and slide in the direction of the arrow, which locks the button depressed, slide the button back to its original position. 5) Compatible with: NIKON D3/D700/D300/D2H/D2H/D200/D1H/D1X"