The pocketwizard cm e3 acc 1 remote accessory cable is a 30cm cable for connecting a plusx plus iii flextt5 or multimax with acc port to a canon e3 remote terminal or sub miniphone 332 or 25 mm and acting as a pre trigger cable a pre trigger cable controls both the half press and full press function of your cameras shutter release when a camera is pre triggered it is like holding your cameras shutter release button in the half pressed or meteringfocusing position msmm stereo to