Okay, a few things to understand:
One, the Alarm Industry jargon is different from computer/internet or mobile phone jargon. When we say "wireless" in the Alarm Industry, we're talking about local wireless, i.e., wireless sensor-cum-transmitters on doors and windows sending signals back to RF Receivers connected to the Control Panel, to let the CP know when said door/window is open or closed. "Wireless" in alarm-speak has nothing to do with communicating with a Central Monitoring Station, or with the User's mobile phone.
By the way, also in Alarm Jargon, when we say "Control Panel", we're talking about what you call the "computer board in the cabinet", not the keypad, which we call the Keypad. The keypad is just the interface between the User and the CP (Control Panel).
The modules you show above are all for local wireless zone expansion, i.e., adding more zones to your system without having to run new wires to new doors, windows, motion sensors, glassbreak sensors, etc. None of them are supported by your DSC 1500, which can only handle 6 hardwired zones.
Two, there are devices that can be added to newer Control Panels, like the DSC 1864, that give it the capability to send notification directly to your mobile phone, as well as let you use your phone to query and manage your CP. Google EnvisaLink 4 and check it out.
Three, hardwired zones are compatible with all professional-grade control panel models, old or new, although you will probably have to replace the End-of-Line Resistors (EOLRs) in the zone loops. Those vary with make & model, and will have to match the new CP.
Three, if you upgrade your 1500 Control Panel, you will need to replace your keypads. Unlike Ademco/Honeywell panels, DSC uses a wide variety of KPs that have to be matched with its wide variety of control panels, and almost every time they come out with a new improved CP, it's not compatible with earlier model keypads.
Alarm techs all have their pet brands, and lot of them favor DSC. I personally favor Ademco (now Honeywell) brand because every new upgrade in control panel they've come out with, in the last 25 years or so, has been back-compatible with older keypads and local RF Receivers: Ademco/Honeywell has the industry's best record for making their controls and peripherals back-and-cross compatible. If a client has any Ademco/Honeywell system that's no older than 25 years, no matter what model, then I know that a new Ademco/Honeywell Control Panel is compatible with the old KPs.
Ademco/Honeywell panels also support the EnvisaLink 4 module, and can be monitored and managed from your mobile phone, just like the newer DSC panels. If you're going to upgrade your system, I recommend you switch to Ademco/Honeywell--you'll have a better chance of not having to replace your keypads when you upgrade again 25 years from now.
Just my $0.02 worth. If you're Canadian and want to keep buying Canadian, by all means stick with the DSC brand.
EDIT: Btw, my screen name is ChosunOne, not bertus. That's another poster.
