[ ROHS CE ] VILTROX FC-240C FSK 2.4GHz Wireless Remote FM Flash Speedlite Studio light Radio Trigger / wireless shutter release for Canon DSLR camera & flash , 100M Remote distance Radio flash trigger, you can set up your external flashes on tripod With one connectiong cable , It can be used as a wired / wireless remote shutter release .the cord is optional , it doesn't include in package . Also can fire the studio light , as long as you have the C1-3.5mm cable and 6.35mm adapter. Remote control distance range is about 30M in open area. It is composed by transmitter-FC-240TX and receiver FC-240RX ,so you can control several receivers in the same time by one transmitter.