" --The Viltrox 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"