The X1-N triggers are comprised of separate transmitter and receiver units, with X1-N receivers being compatible with Nikon DSLR compatible speedlites like the Nikon SB-910, SB-900, SB700 etc. As well as Nikon iTTL compatible flashes like Godox’s own V860N.The X1-N provide TTL, HSS (High Speed Sync) and most of the features comparable popular TTL triggers provide, even a HSS Pre-sync Timing Adjustment.Godox have even considered small (though important) details like PC Sync Input and Output, something most radio triggers constantly miss.At the time of writing this the X1-N unfortunately do not provide Second Curtain Sync. Though that may change in time as the Canon version X1-C have now been updated through firmware to provide Second Curtain Sync.