With the Triple Connector TC-1000 you can use up to three program flashes off-camera at the same time. The TC-1000 is connected to the camera via the Off-Camera Cable OC-1100. After that each program flash needs to be connected to the Triple Connector with an EX cable. To use the program flash 3600 HS (D), a Off-Camera Shoe OS-1100 is also required. The TC-1000 is of great use when wireless remote does not work (due to very strong sunlight) or is not suited to your purposes.