Concord Wireless Zone Question

[cwilliams28@xxxxxxx]

I'm researching wireless security devices to replace an aging Rollins System
VII. I'm very interested in the GE Concord because it looks like most of my
existing ITI 319.5 KHz wireless sensors will work with the Concord RF
receivers. At today's prices I have about $2K invested in sensors, which I'd
like to preserve. I have tried learning one of each type of my existing
sensors into a Concord Express system one of my friends has, and they work
fine.

Here is the ad for the system I am looking at.

"Concord is a full-featured, hardwire/wireless hybrid security system that
uses advanced technology for burglary and fire detection, making Concord a
dependable security system that is both easy to install and simple to use.
Concord?s modular design provides outstanding system flexibility to meet the
needs of virtually any customer. With 2 partitions and up to 76 zones. -
Concord Wireless Package Includes Concord Integrated 8-harwire zones and 16
wireless zone panel, 2x16 LCD Touchpad, phone cord, RJ31X jack, lock set,
(2ea.) Crystal Door/Window Sensors, (1ea.) Crystal PIR Motion Sensor, (1ea.)
hardwire interior speaker"
The part I don't understand about this configuration is the "Integrated
8-hardwire zones and 16 wireless zone panel." What exactly is a wireless
zone? Is a wireless zone really a wireless sensor (i.e. does this mean that
I will have to add another rf subsystem if I want to use more than 16
wireless sensors? I need at least 30) Or is a wireless zone actually a group
of sensors? I'm completely wireless (with some X10 help for lights and
sirens) so don't need the hardwired zones at all.
This seems to be the only thing I can't figure out about this system. I hope
someone can help clue me in.