A. With this flash hot - shoe connection cable, it's possible to use the flash for off - camera TTL flash photography. The distance between the flash and the camera is about 1.2 meters, which is similar to mounting the flash on top of the camera. B. It supports most of the automatic functions of the [Specific Brand] series and many of the brand's flashes with TTL function. One end of the connection cable is connected to the camera hot - shoe, and the other end is connected to the flash. It's also equipped with a fastening device to reduce the risk of it falling off. C. The applicable camera models cover a wide range of film SLR cameras and digital SLR cameras (except EOS630/RT). The applicable flashes include 580EX II, 580EX, 550EX, 430EX, etc. D. Product Name: OC - E3 Off - Camera Flash Connection Cable Color: Black Material: Plastic Package Contents: 1 off - camera flash connection cable Only the above package contents are included, and there may not be other products. Note: Light reflection and different displays may lead to slight differences between the color of the item in the picture and the actual product. The allowable measurement error is around ±1 - 3 cm.