Applies to Nikon DSLR series cameras and is compatible with i-TTL auto flash.Two transmitting styles (optical transmission and 2.4G wireless transmission) offer creative light effects.As master flash, it triggers Nikon speed lights e.g. SB-900, SB-910, etc. in TTL or manual mode.As slave flash, it receives signals of Nikon speed lights e.g. SB-900, SB-910, etc. and wireless commanders of pop-up flash on Nikon D7100 / D7000 / D800, etc.Supports HSS, front & rear curtain sync, FEC, multi flash, manual flash, etc.Convenient dot-matrix LED panel for clear and easy operation.