Pocket Wizard CM-E3-ACC Pre-Trigger Remote Cable This is a special remote shutter release cable called a Pre-Trigger Cable. A Pre-Trigger cable controls both the half-press & 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 Pocket Wizard radio to independently control both half-press & full-press functions. Added bonus: All CM-E3-ACC cables shipped into the market starting July/ August 2013 include a MSMM Adapter (stereo to mono miniphone) which converts a CM-E3-ACC cable to a standard CM-E3 miniphone cable. This change coincides with the introduction of our new retail packaging. All cables are now packaged in a environmental friendly cardboard box with rececyled white labels showing both ends of the cable as well as compatibility list. This replaces our old packaging of a zipped bag packaging.A Standard Cable (CM-E3) works with most Pocket Wizard radios but has no half-press control, & is for basic remote triggering only. (Using a CM-E3-ACC cable with a MSMM Adapter will provide the same function as a CM-E3 cable.) A Pre-Release or Pre-Trigger (–P) Cable (CM-E3-P) works with most Pocket Wizard radios. This pre-trigger cable has a switch that means that you can toggle half-press on or off at the camera position, but not remotely. (Using a CM-E3-ACC cable with a PTMM Adapter will provide the same function as a CM-E3-P cable.)