This cable connects a Nikon camera with a 10-pin remote connector (like the D2/3/4/5/6 series and the D700) to a Pocketwizard for remote triggering- but it also has a switchable “pre-release” feature, which essentially keeps the camera awake by spoofing a half-pressed shutter. Why? Well, maybe you hate your batteries and wish they would run out quicker, but more likely you’re looking for a faster responsetime, which this will also help with.