A warning shot is a good analogy.
Consider this:
you dont fire a warning shot unless you have more ammo to deliver the killer blow.
The issue about the alarm is quite simple, no alarm will work without a timer, no timer can be set up properly without an interface(display).
The patent also covers external input buttons and linking devices to your board, so if you can change any values on your board (ie debounce, dwell etc, pretty important stuff) you are in violation of a patent WDP has held and made public for a long time.