...keypads are often specific to the panel, and installed together. After 22 years your system is likely to be obsolescent, and a compatible keypad virtually impossible to source (except, possibly, off eBay).
Working PIRs, bell-boxes etc. should be re-usable, but companies often want to install their brand with the bell-boxes.
A panel/keyboard update de minimis should probably work, but I wonder whether they've quoted for replacing a wired system with a wireless one?
I don't like the keyfobs (particularly if held on the same keyring as the house keys). I removes one potential level of protection (that provided by knowing the alarm code) if you drop your keys in the street.
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Home alarm upgrade new
Home alarm upgrade new