1 transmitter and 2 Recievers available. The hotshoe mounts are a flimsy plastic. The ones I have have been repaired via the tutorial found here. They are included also. Both receivers have the latestest firmware and can be triggered by a JRX transmitter.
Radio Popper Px has a setting for both Canon and Nikon. They are in perfect working order. I am not using TTL or HSS off camera anymore so I do not need them.