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Shake flashlights, aka Faraday flashlights, are based on Faraday’s Law of Electromagnetic Induction, which is a basic law of electromagnetism predicting how a magnetic field will interact with an electric circuit to produce an electromotive force. Shake flashlights are ideal emergency flashlights, educational lights used to demonstrate renewable energy concepts, and perfect for outdoor recreation activities including camping, backpacking, fishing and hunting.