Delivered within 3 days! This is the issuer Yongnuo I waited for years! It will enable me to my YN-controlled 560III (and only one and the new V4), synchronization is done very simply. Most: Remote control flash Does not cost more than a Cactus Also control the zoom Control up to 6 flash Compatible with Rf602 and 603 (only triggered the flash and not to set the flash distance)