I believe that cell phones are a great tool. But they can stop working for a variety of reasons (some of which are beyond our control).

I did this drill with my local CERT group. Two found dead batteries in EDC flashlights (not mine). All of the women had whistles, none of the men (but they were in their go bags).

Thanks everyone for helping me source this for my group.
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"We are not allowed to stop thinking"