RF-602 is using FSK 2.4GHz wireless frequency, suitable to use this free channel in many countries; guarantee 8f the transfer speed, distance and stability. It is available to purchase the RF-602RX (RF-602 is combined with transmitter RF-600TX and receiver RF-602RX) for using multi-receivers at the same time, also purchase the 3pins YONGNUO connector to control many types of flash light and camera. When using the RF-602 reserved to "Canon" or "Nikon" to control the flash light, the flash sync speed is up to l/250s, and 100 meters. Now YONGNUO is provided all world wide DSLR camera remote plugs.1.Wireless flash trigger: Transmitter compatible with the device under flash trigger mode: Canon EOS: 1D series, 5D series, 7D, 60D, 50D, 40D. 30D, 20D, 10D, 550D, 500D, 450D, 400D, 350D,1000D, Rebel T2i,T1i,XSi,XS,Xti,Xt, Powershoe G10, G11, G12. Receiver compatible with the device under flash trigger mode: Canon Speedlite: 580EX II, 580EX, 430EX II, 430EX, 270EX, 220EX.550EX, Nikon: SB-900, SB-800, SB-600,(This item is not compatible with SB-400). 2.Wireless Remote Control : Reference picture 8, you need to order LS-021/* Shutter Connecting Cord seperately. 3.Wireless studio light trigger. Package Included:RF-600TX for Canon (Transmitter) x1,RF-602RX (Receiver) x1,Receiver to 3.5mm cable x1,3.5mm switch to 6.35mm plug x1,User Manual x1 Please note: There is no battery in this package.