1. Using this flash hot shoe connection, you can use the flash for off-camera TTL flash photography at a distance of approximately 1.2m from the camera, providing performance equivalent to mounting the flash directly on the camera's hot shoe. 2. Supports all automatic functions of Canon EOS series cameras and all Canon professional flash units with TTL functionality. One end connects to the camera's hot shoe, and the other end connects to the flash unit. Includes a secure locking mechanism to prevent accidental disconnection. 3. Compatible with all Canon EOS series film SLR and digital SLR cameras (excluding EOS 630/RT). Compatible flashes include Canon 580EX II, 580EX, 550EX, 430EX, and other compatible models. Product Name: OC-E3 Off-Camera Flash Cord Color: Black Material: Plastic Package Contents: 1 x Off-Camera Flash Cord Note: Light reflection and different display settings may cause slight variations in the color shown in the images compared to the actual product. Allow for a measurement tolerance of +/- 1-3 cm due to manual measurement.