Other Functions
Some mechanically powered flashlights include additional functions and features beyond just a source of light. Models sold as emergency lights have additional functions useful in emergencies, such as flashing red or yellow lights for roadside emergencies, sirens, and AM/FM, weather or shortwave radios. They may also include alternate means of charging the battery, such as solar cells, or cords that plug into a car cigarette lighter jack.
The quality and long-term reliability of these devices vary over a wide range, from high-reliability mil-spec emergency equipment down to one-time-use non-repairable throwaways.
Read more about this topic: Mechanically-powered Flashlight
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