The sdmv flash wave iii is a compact radio slave system for wireless triggering of both speedlite and studio flash units as well as cameras the flash wave iii provides sixteen individual radio frequency channels on a 24 ghz frequency band an optional compatible shutter release cable allows you to remotely trigger your camera using a two step test triggering button enabling you to perform auto focus and shooting functions as well as activating your camera from sleep mode the flash wave iii e