Pixel X800N Replacement Flash Light Speedlite for Nikon D810 D800 D600, Shoe Mount TTL Kit Speedlite for Nikon DSLR Camera Replacement X800N flash speedlite for Nikon, compatible with multiple flash modes( iTTL / M / RPT), compatible with Nikon D810 D800 D600 and all Nikon SLR brand, stroboscopic flash duration is up to 500Hz. Wireless Control System: FSK2.4G wireless control, optical control, master/slave and S1/S2 function Flash recycling time is less than 2.5 sec (1/1 full power output) and a higher GN60 Speedite (ISO100 200mm,as Master unit or Slave unit, it will make your shooting easier and prefect Overheating Protection System: Reliable multi-dot matrix temperature control; Alarm design, the use of more assured, safe and reliable Any problem or concern, feel free to contact with us