The portable wireless remote unit for Nikon advanced wireless lighting. Supports the Nikon creative lighting system. Functions only as a remote speedlight unit. Supports i-TTL (for automatic balanced Fill-flash), D-TTL, TTL and manual. Accurate i-TTL flash control achieved through flash exposure monitoring control. Advanced wireless lighting available. Auto FP high-speed sync; use with fast shutter speeds achieves effective blurring of out-of-focus background elements. FV lock holds flash value, enabling recomposition prior to shooting.