Hold the flashlight horizontally and shake it so the magnet moves through the coil. Shine the light at the audience. Original construction: purchased. The flashlight has had its capacitor and on/off ...

The early white LEDs never put out enough light, and charging a flashlight by shaking it every twenty seconds is annoying. There is another technology that desperately needs a battery-less ...

Shake Flashlight makes you jiggle your phone to ... LED flashlights consume little power, so leaving the light on doesn't significantly drain the battery. However, your phone may overheat.