The strato ii multi is a flash trigger and it can be used as a wired or wireless shutter release the 2 4 ghz transmitter and receivers offer ranges of more than 150 meters and sync at speeds of 1250 second transmitters feature an innovative ttl pass through hot shoe allowing full ttl mode to be used with a camera mounted flash receivers offer flash wake up functions its fast sexy and powerful perfect for your studio or location work 4 channels 150 m range studio st