Yongnuo 2.4GHz Wireless Flash Trigger/Receiver and Shutter Remote for Canon 1D/5D/7D/10D/20D/30D/40D/50D DSLR 2.4GHz wireless remote receiver only The flash sync speed is up to 1/250s Working range is up to 100 meters Extra receiver to add another speedlight to your existing Yongnuo system Includes 3.5mm PC sync cord