Thank you for purchasing YongNuo products in advance. Please read this user manual carefully and learn how to use camera and flash before. This product is a wireless transceiver integrated design, for the convenience of description,the product will named “transmitter” when mounted on the camera hot shoe in some cases, while named “receiver” when mounted or connected to the flash. Contents General description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Cautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 The name of each part for RF-603 II . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Preparation before using . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-7 Wireless flash trigger awaken & testing . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Wired/wireless remote shutter release . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Function extend . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-11 Troubleshooting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Include items/Optional Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3