The flash trigger doubles up as a shutter release, including a delay mode. (Check different listings for the right shutter release cable. The receivers have 3.5mm jacks.) Though the receivers have many hotshoe contacts, the transmitter only has one and cannotÂ wake up sleeping flashes.
See the Trigmaster in action on the Aputure blog.
The first factory samples of the more advanced Trigmaster Plus will be out tomorrow.