A shake flashlight is a type of flashlight that recharges by passing a rare earth magnet through a copper wire coil and storing the energy in a rechargeable battery, NiMH or Li-ion, or a capacitor. Human power is an external power source. It uses Faraday’s principle of electromagnetic induction to generate electricity. Stored electricity powers an LED bulb.

Shake flashlight is useful as an emergency flashlight stored in an emergency kit or emergency bag. It is ideal for camping, hiking, and other recreational activities. Educators include a shake light as part of their STEM Learning program. Shake lights are lightweight and come in various lengths. Their no replacement battery design is eco-friendly by eliminating battery disposal.