A-6PreparationAAdvanced Wireless LightingWireless multiple flash-unit photography with CLS; multiple remoteflash unit groups can be controlled with the master flash unit.Quick wireless controlWireless multiple flash-unit photography in which the flash outputlevel ratios of 2 remote flash unit groups (A and B) can be easilybalancedDirect remote wireless multiple flash-unit photographyWireless multiple flash-unit photography suited to taking pictures ofa fast-moving subjects; the master and remote flash units fire almostsimultaneously because the master flash unit does not emit monitorpre-flashes.Link modeEnables selection of communication type between Nikon Speedlightand camera. Available selections are pairing and PIN code.PairingSpeedlight and a camera paired beforehand communicate.PIN codeSpeedlight and a camera with the same 4-digit PIN codecommunicate.