Adjust flash function though the controller directly. Wireless triggering function.</br>Set group?? up to 6 groups. Set the flash output and flash mode. Modify multi flash frequency and count.</br>Modify zoom for each group. Compatible with RF602 / RF603 / RF603 II. Transmission Range: 100 Meters.</br>Support Wireless Shutter Receiver of RF603 / RF603 II. Large and clear screen?? user friendly interface.</br>Powered by two AA batteries. (not included) Suit for Canon DSLR camer