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Note added at 2 hrs (2011-05-11 10:41:16 GMT)
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I found also ultimate " crank" radio , I'm checking .......

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Note added at 2 hrs (2011-05-11 10:41:51 GMT)
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A crank radio is the ultimate emergency weather alert radio receiver. Why? Because it will ...

work without public electrical power,
work without needing replaceable alkaline batteries.
You generate the electricity that the emergency radio needs to operate, simply by cranking its handle (about two turns per second, on most models).

The cranking action turns a small dynamo inside the casing, thus recharging the internal rechargeable batteries.

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Note added at 2 hrs (2011-05-11 10:43:05 GMT)
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Emergency Crank Radio - American Red Cross Radio
http://www.sosready.com/collections/frontpage/products/emerg...

Difficult to be sure without more context, but assuming these are various communication systems, and the last one, if all else fails, is based round a radio system; I say 'based', because it depends what the others are — for example, they might be landline-based...

Since mobile phones have now largely supplanted PMR systems in many fields, this could simply mean that if all else fails, they will revert as a last resort to good old walkie-talkies.

As ever, cannot be any surer without understanding a lot more of the specific context here.