YONGNUO 2pcs YN-560 IV Flash Speedlite With 560TX-C Transmitter for Canon EOS 5D,5D25D Mark II,1D,7D, 60D ,50D, 40D, 30D, 600D, 550D, 500D, 450D, 400D, 350D ,300D,1100D,6D With 2pcs EACHSHOT&reg; Diffuser YN560IV Kit, comes with YN-560TX and diffusers for Canon. When the YN560 IV and YN560-TX used as transmitter, it can realize remote control the parameter settings. YN-560IV Support Electric Zooming Function:The flash coverage can be altered between 24~105mm through the [ZOOM] button. One YN560 IV can respectively receive the wireless signal from YN560 IVYN560-TXRF-603 (I/II)RF-602,with optional 16 channels;