Pixel TF-321 E-TTL Flash Hotshoe Adapter with PC Connection Port for Canon EOS Cameras and Canon 580EX, 580EX II, 550EX, 430EX 1.Pixel TF321 enables you to trigger flash attached on top of the adatper hot shoe as well as other flash connected via PC sync lead. 2.It fits all Standard ISO 518-2006 hot shoe flashgun and canon EOS cameras. 3.designed with port, it can connect an additional studio light or flash via a PC sync cable. 4.Pixel TF321 hotshoe adapter can trigger flash attached on top of the adatper hot shoe as well as other flash connected via PC sync lead. 5.Not suitable for devices with sync voltage of more than 6 volts.