Doh!!! It was only one piece. Well, I guess it wouldn't be so bad to have 2 separate switches on the same wall. Just a little bit weird but...

I ordered some stuff from X10 Canada, and the guy will give me one of these Transmitters for free once he has stock. He told me the one that I'm getting has two lights (RED & GREEN LEDs). I wonder what the green led is for?

Simon