This Componor Combined i-TTL Off-camera Cable is used to control the flash gun. Its makes the operation of flashgun more flexible. * It allows user to make 3 kinds of modification by flash terminal graduation, control 3 flashguns at the same time (need extra cables and flash adapters) * It has individual switch of each terminal. user can choose which flash to be On or OFF. With changing switch for choosing which flash to be the TTL Master Flash. * Transmitter has a 3.5mm input socket witch can connect with your camera"s PC sync port. in this case, you can keep on use your hot shoe and trigger the other flashes. Receiver has a 3.5mm output socket. It can be use to connect your camera"s shutter remote port(Need extra shutter connect cable), or connect the studio flash via attached 3.5mm to 3.5mm sync cord, or connect with the flash via PC sync cord (need to purchase extra 3.5mm to PC sync cable). * User can also control which flash to be ON or set to TTL master flash on camera side