Fully compatible to work with all Digital SLR Cameras ♦ 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 * A competing brand has a constant current drain of 90 milliamperes ♦ The pulsar 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