Alan makes some good points, but i will try to expound on them. All of our lights come with 1 sync cord (so if a package has 4 lights, you will get 4 cords). In most situations, if you can get one light to fire, the rest should also fire. You can trigger the one light by the sync cord or radio remote. If you will be shooting in very bright light, or around other photographers, or in certain "normal" shooting environments, the slave eye can be fooled. In this case, a reciever on each light would help. (the transmitter is on the camera, so only one is needed, the receivers are on the lights)
If you wish to be able to wirelessly adjust the light output by using the CyberCommander, then a reciever for each light is required for full functionality.
Be aware, that not all cameras have an integrated PC connection for the sync cord (usually found on the left edge or left front of the camera under a cap or flap, and looks like a snap. PC connections should not be confused with USB connections, as PC in this sense is not for "personal computer"). If your camera does not have one, you will need a hotshoe adapter (found in the hardware section of our site). Most new DSLR's under $1000 do not have one, and new DSLR's over $1000 tend to have them, but this is not set in stone.
TS
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