Elinchrom Skyport RX Radio Slave System question?

I am looking at getting the Elinchrom Skyport RX Radio Slave System which I read about on the Scott Kelby webiste.

http://www.scottkelby.​com …08/archives/115​5#comments

I am a newbie when it comes to reading all the info about channels etc so thought it best to ask.

Question I wish to ask is as I buy more lights(looking at just 2 at the moment) how many lights can the transmittor handle?I will probalry look at getting more lights at a future time but was wondering will it handle 4 lights or would I have to get a stronger transmittor?

One transmitter will trigger as many receivers as you have set to the same frequency and "channel" and are within range of the transmitter.