Yongnuo RF-602 / RF-603 2.4G ultra-long range wireless flash system. The lead flashing distances up to 100 meters / 328 feet above. Large-size LCD display. The YN560-III is equipped with large-size LCD screen, with clear and intuitive view, easy to use. By pushing the button on the speedlite, it can make the flash covered length range from 24mm to 105mm. The high sensitivity wireless triggering sensor inherits from YN560, which makes the Slave function ( S1, S2, RX mode). YN560III provides charging socket for external power pack, to meet your higher demand for charging recycle.