YFY YONGNUO Professional 2.4GHz Wireless Flash Receiver RF-603AC Work for RF-603 Series Transceiver You can use this single receiver RF-603AC with RF-603 transceiver for both Canon and Nikon version . You can mount RF-603 transceiver as transmitter into Camera hot shoe, and mount RF-603AC receiver into the AC Power Studio Flash, and then connect the receiver and studio flash via RF-603 6.35mm PC cable, this Studio flash can be fired after pressing the camera shutter button One RF-603 transmitter can fire multi RF-603 receiver / multi RF-603AC receiver.