Kaavie e-TTL Flash Hot Shoe Adapter with Extra PC Sync Port for Canon DSLRs and Flashguns This adapter enables you to trigger flash attached on top of the adatper hot shoe as well as other flash connected via PC sync lead. It fits all Standard ISO 518-2006 hot shoe flashgun. It has a PC sync socket so you can connect an additional studio light or flash via a PC sync cable. It supports all function of Canon e-TTL flashgun. Not suitable for devices with sync voltage of more than 6 volts