One device for calling for help is a loud alarm with a switch. Sometimes, when it is necessary to call, a person is unable to, so it would be useful to make it voice activated. Also, even a loud alarm can only be heard in a relatively small area, so something that sends a message on the internet and to rescue services would be better. Sending the location is possible is the alarm has a GPS locator. Sound and video can help determine what kind of rescue is needed and / or if the situation is hopeless at least make it less likely that this situation will happen again, like a flight recorder.

A device that could accomplish all of this is a wirelessly networked laptop with a video camera, microphone and speaker. Eventually a rugged special purpose device could be made, hopefully small enough that it can be worn on clothing.

Jerry pointed out that this device should be good in any danger situation even if the person can't speak or move so it must have body sensors to measure sweat, cardiac rate etc... to detect the body's answers to dangerous situations.
 
 

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