Never buy batteries again and avoid the frustration of flashlights that dont work when you really need them! Diamond® Shake flashlights are the latest generation technology, so theyre brighter & last longer than a Forever® flashlight or Nightstar® flashlight. For a light that works when you need it, these are perfect for emergency preparedness kit use. NO batteries - NO bulb! Just shake to recharge! 1 1/2 minutes shaking gives you up to 2 HOURS of blueish white LED light. It stays super bright for 20 minutes, then starts to fade but you can still read read in the dark with it. Just shake it again for a few seconds tho, and the brightness comes back. The Diamond® LED flashlight lasts forever, its tough polycarbonate sealed waterproof housing is rated to 125m below water. Theres NO parts or gears to wear out or break. The Forever flashlight is perpetually rechargeable, recharged by a magnet moving through a coil that recharges the flashlight forever! They are fantastic for kids at Halloween or year round, it always works & is fun to charge. The Diamond LED shake flashlight will save you $ on battery costs & bulb replacements forever! Its GREAT for the car & home emergency kit, kids, in the boat or camping and the Unbreakable LED light bulb lasts 10 years! The Diamond® Shake light is available in Clear, Yellow or Black housings, in a 20 minute or 2 hour version & has 2 Patents for technology & design. Its available in bulk with custom logos & packaging, too. We love this product and guaranty them 10 years!