Works as a wireless flash trigger and receiver, RF-603II is fully compatible with previous generation products
Compatible with Canon 60D/350D/450D/500D/550D/600D/650D/700D Pentax
New single-transmit mode (TX), make it easier to test lead flashing, more power saving

It transmits all the settings in External Flash Menu of your camera to remote flash(es), you can control flash(es) through camera menu. It supports TTL function. LCD screen display, multi-buttons quick operation.
The firmware can be upgraded through the USB interface. Support wireless shutter release function. The focal length(zoom)of the A/B/C three groups of flash can be adjusted separately. Equipped with the AF focus assist light (can be disabled).
Grouping flash mode: E-TTL/Manual flash/Super sync. Supporting mixed use of the A/B/C three groups of flashes with E-TTL, Manual flash, or Super sync flash mode. The exposure compensation or flash output of A/B/C three groups of flashes can be adjusted separately.