6150rf capacity

["LJP602" <l.penner@xxxxxxxxxxxxxxxx>]

I am a diy alarm installer and have a vista 20p and a 6150rf in the system.
Is there a difference between different 6150rf keypads relative to the
capacity of wireless transmitters. I see some of them say they have the
capacity for 16 transmitters and others that talk about 8. Is there a way of
telling the capacity visually?

Thanks
Larry