When using i-TTL compatible Nikon digital SLR cameras and Speedlight, user can divide the Speedlight units into three groups and control the flash output independently for each group. Features a Commander function that can trigger wireless remote flash (SB-910, SB-900, SB-800, SB-700, SB-600, or SB-R200) units without a master flash unit. One-touch switching between close-up and Commander modes. Easy-to-use close-up flash operations. Two types of operations: Dual-light close-up flash and Triple-light close-up flash. Easy-to-view LCD panel. Compact and lightweight. Soft Case SS-SU800 (supplied). When using the SU-800 with cameras not compatible with i-TTL flash control, only close-up flash operation (using cords) is possible in use with the optional TTL Cord SC-30. I won't repeat what many other reviews have already said, other than the flash is great..