Pre-trigger cords ( With Switch ) This cord also keeps the camera “awake” ready for the shot. When you want to view the photos, Switch off the pretrigger and the camera operates normally as if no cord were in the camera. You can now view and edit your pictures normally. Turn the switch back on, the camera focuses. You are ready for your next photo session. Turn switch off, camera is able to sleep saving power. Also less ware and tare on camera and cord from constant unplugging