With the Version IV of YN 560 Yongnuo has now installed with a TX unit. This function can be other YN 560 IV or III and 602/603 directly control the Flash Trigger RF by lightning. The control of YN YN 560 III and has been tested with 560 II RF 603 which ideally worked. The data transmission to the YN 560 III (Zoom, performance and fashion) works very well. With this flash and the 560 TX is now has the choice of which is a cheaper (lightning unleashed on the camera or flash). Something Yongnuo see now still brings new. Now this combination is missing actually only with TTL, eg a YN 568 controls 622 other directly TTL Blitzer via radio without RF and best also the minutes of the YN 560 series he has on board.