Vktech&reg; Debao SU800 Wireless Speedlite Transmitter Commander for Nikon Functions as a wireless commander for the SB-R200, SB-910, SB-900, SB-800, SB-700 and SB-600 Speedlite units Supports the Nikon Creative Lighting System (CLS) and compatible CLS cameras Controls an unlimited number of Speedlights for up to three groups Offers 4 independent channels for competitive shooting environments Built-in AF assists illuminator for critical focus in low-light situations