The Dual Intelligent Speedlight is a digital lighting system for standard and macro flash photography and is compatible with most digital Nikon SLR camera models. It is dedicated to the i-TTL flash system and includes a standard flash and micro ring flash. Among its many professional features, it offers fast recycling circuitry, rear curtain synchronization, and an autofocus assistance beam as well as a zoom flash head that tilts and swivels for bounce flash at any angle. The macro ring flash unit attaches to 58mm and 67mm lens threads with additional adapter rings included. The ring flash can be detached from the main flash when not in use.