A wind up radio is a great device if you need a radio and have no electricity or batteries. These come in handy if there is a storm and you lose power or in case of emergency.
It can vary, but wind-up radios can last up to an hour or two on one full wind-up.
Doppler radar
Solar powered radios will last far longer than wind-up radios, provided there is adequate sun.
The wind-up radio was invented by a British man - Trevor Baylis. It is wound up by an integral handle, which winds a mainspring (a larger version of the mainspring found in a watch. The spring slowly unwinds, turning an internal generator - which powers the radio. See related links to Wikipedia pages on the inventor - and the radio.
Trevor Baylis. for people in Africa
potential to acoustic energy
Wind up radios are ones which a user must use some type of hand crank in order to generate power to the radio. Amazon has a variety of wind up radios one can purchase with prices varying depending on model.
Everyone uses wind
You can get a wind up radio for outages.
More than ever.
a solar/wind up radio combo is best.
to inform the Africans about aids.