Yongnuo Wireless Flash Trigger RF603 II C3 2.4GHz 100M for Canon 1D / 1DS, EO0S 5D Mark II / 5D / 50D / 40D / 30D / 20D / 10D 1.Compatible with Canon 1D / 1DS, EOS 5D Mark II / 5D / 50D / 40D / 30D / 20D / 10D Series,etc. 2.support Auto-Focus, Continuous shooting, Long Exposure,and Bulb shooting. 3.Improved Flash / Shutter control Buttons,highest flash sync speed up to 1/320 s. 4.Able to fire pixel mago,pixel x800c,pixel x700c.yn560 iv,yn685 flash speedlite . 5. FSK 2.4GHz wireless remote control system,Shutter release: half-press, full-press