The speedlite JY620N is completely compatible with Nikon i-TTL system and supports 24-105mm auto zoom. High-performance TTL electronic flash unit, perfectly compatible with Nikon i-TTL. Sharp and Clear LCD backlite screen Support Nikon wireless flash system (master/slave).Support wireless output setting for different groups in M mode. Support On-Camera/wireless TTL Exposure Lock. Front/rear curtain sync.Temperature Test (high-temperature alarm ). Quick lock;Stroboflash, Parameter memory function;Low-power indicator