The PocketWizard CM-E3-ACC-1 1' Pre-Trigger Remote Cable is used for connecting a PlusX, Plus III, FlexTT5 or MultiMAX with ACC port to a Canon E3 remote terminal or sub miniphone (3/32" or 2.5 mm). This is a special remote motor drive cable called a Pre-Trigger Cable. A Pre-Trigger cable controls both the half-press and full-press function of your remote camera's shutter release. When a camera is "pre-triggered", it is like holding your camera's shutter release button in the half-pressed or metering/focusing position. This ACC cable allows a compatible PocketWizard radio to independently control both half-press and full-press functions.