Trigger your built-in Optical Slaves! Fire any flash that has a built-in optical slave with your Digital SLR Exceeds range of competing brand by 50% in most studio settings with existing built-in slaves Light weight, compact, and uses only 2 AA batteries Built-in regulator increases battery life by many months EVEN IF YOU FORGET TO TURN THE SYNC-LINK OFF. A competing brand has a constant current drain of 90 milliampers. The Sync-link cycles to zero when not fired, and cuts off after the system is charged for the next flash Built-in safe sync to keep your camera protected Far superior IR filter will not cause any unwanted color shifts
