I think you are asking why are there not strobes or flashes with built in receivers?


Personally I use a Radiopopper Jrx transmitter fits the hot shoe of my canon.


Then seperate Radiopopper receiver for my 580exIIs


All the EXIIs can be run on seperte channels


And all of this of course is manual,


Works fine indoor and out. But yes you do need a cable for the receivers to the speedlights.


Welcome FlashZebra