This optical slave is packaged in a convenient hotshoe that will accept the proprietary, non-ISO hotshoe found on recent Sony and Minolta flash units.
This device will immediately fire a connected flash unit when another flash burst is detected. This allows a remote flash to be fired without any connecting wires.
The triggering flash must not emit a pre-flash as this will prematurely fire the connected flash.
It requires no batteries or other power; it runs off the flash unit to which it is connected.
Price: $16.00 + shipping