Features: Compact & lightweight remote Speedlight Unit Supports the Nikon Creative Lighting System (CLS) & compatible CLS cameras Easy-to-set analog controls Built-in target light & AF Illuminator allows for proper position of Speedlight on the subject as well as autofocus operation in low light situations i-TTL Flash control for accurate flash exposures in close-up & other multiple lighting applications Can be set to one of three Speedlight Groups (A, B & C) Offers four independent channels for competitive shooting environments Integrates perfectly into multiple flash situations including the SB800 & SB-600 Speedlight units