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2. Emergency radio - Wikipedia

   en.wikipedia.org/wiki/Emergency_radio

   Commonly, such radios are designed to use minimal battery power, and a common feature (especially on units sold in less-developed countries where electrical supplies may be unreliable or nonexistent) is a hand-cranked electrical generator along with a rechargeable battery to store the generated energy (the device is sometimes known as a ...

3. Freeplay Energy - Wikipedia

   en.wikipedia.org/wiki/Freeplay_Energy

   In present Freeplay radios and other products, clockwork mechanisms storing energy in a mainspring have now been replaced by small batteries charged by cheaper hand-crank generators. [9] Freeplay Energy produces a variety of consumer devices in addition to radios, including flashlights, lanterns, mobile phone chargers, and foot-powered generators.

4. Survival radio - Wikipedia

   en.wikipedia.org/wiki/Survival_radio

   During World War II, Germany developed a hand-crank 500 kHz rescue radio, the "Notsender" (emergency transmitter) NS2. It used two vacuum tubes and was crystal-controlled. The radio case curved inward in the middle so that a user seated in an inflatable life boat could hold it stationary, between the thighs, while the generator handle was turned.

5. Batteryless radio - Wikipedia

   en.wikipedia.org/wiki/Batteryless_radio

   Other ways of achieving the same function are clockwork radio, hand crank radio and solar radio, especially for the Royal Flying Doctor Service and School of the Air. [5] [citation needed] As part of an energy harvesting electronics system, some batteryless radios render electricity to storage by means of storage capacitors.

6. Human power - Wikipedia

   en.wikipedia.org/wiki/Human_power

   The original Baygen clockwork radio with crank in winding position. A windup radio or clockwork radio is a radio that is powered by human muscle power rather than batteries or the electrical grid. In the most common arrangement, an internal electric generator is run by a mainspring, which is wound by a hand crank on the case. Turning the crank ...

7. Mechanically powered flashlight - Wikipedia

   en.wikipedia.org/wiki/Mechanically_powered...

   Crank powered flashlights often have radios and other features. One popular feature is a 5-volt USB charging port for recharging cell phones when an outlet is not available. 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 ...