 | Shake Flashlight - You Won't Need to Buy Batteries Never Again - by krmak  11065 views 4m 44s | 5 years ago | Metacafe |
| This flashlight is based on Faradays Law of Inductance: a magnet passes back and forth between a wire coil giving charge to capacitor that powers the LED. Nice thing to have in emergency situations.. It is even good for exercise ;) | |
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