@dascandy no, it's not the same argument, and i'm quite annoyed by the tech people hubris. pay attention, please:
- the sirens can be operated independently from the country-wide alarm network,
- they can be powered from emergency power generators (or, indeed, there are manual variants, as someone pointed that out),
- they don't require fragile electronic equipment (which needs batteries recharged every few days) for the general population to receive the signals.