How to use: Insert the transmitter's hot shoe socket into your camera's hot shoe jack Plug the flash onto the receiver.Switch to On position of the receiver. Make sure the channel selector of both transmitter and receiver at same channel. Press the test button on the transmitter to test before shooting. Special working options are available: If your camera has no hot shoe socket for connect the transmitter to the camera by the PC Sync Cord provided(only the very old camera needed). You can trigger both the Flashgun and studio lights with this pt-04 trigger.If use the receiver on big studio strobe Flashlight or AC salve flash,you can just connect the receive to the studio strobe Flashlight with 3.5mm or 6.35mm jack Plug PC Sync cord(Cord is provided by yourself).