1. Using this flash hot shoe connection, you can use the flash to take off-board TTL flash photography at a distance of about 1.2m from the camera, which is equivalent to being installed on the top of the machine2.It supports all automatic functions of series and all flash lamps with TTL function of .One end is connected to the camera hot shoe and the other end is connected to the flash lamp.A fastening device is attached to prevent falling off3.Applicable models cover all series film SLR and digital SLR cameras (except EOS630/RT), applicable flash covers 580EX II, 580EX, 550EX, 430EX and other lights.Product name: OC-E3 off-camera flash connectioncolor:BlackMaterial:plasticPackage Contents:1 x Off Camera Flash CordOnly the above package content, other products are not included.Note:Light reflection and different displays may cause the color of the item in the picture a little different from the real thing.The measurement allowed error is +/- 1-3cm.