560-tx controller for nikon
The 560-tx controller gives you ultimate control over your 560iii and 560iv speedlights when used off camera. This unit will allow you to control up to 6 different groups of speedlights without having to do anything but make an adjustment on top of the camera.
See how to use it right here - 560-tx 'how to'
*** note *** This item can be used on any camera that has a standard hot shoe. The pins are for nikon and allow for the camera to wake up the speedlight in the event that it goes to sleep simply by depressing the shutter button half-way. By using this product on any other camera system, you simply lose that ability. All of the other control is still available.