content: Don't ever buy this. It is a rip off and a gimmick. Your hands will get tired really fast for shaking the flashlight and 30 seconds of shaking will not even get you 5 minutes of light with consistent brightness. Even more the light dims almost instantly after shaking with no retention of charge whatsoever. Other flashlights that require cranking can give up to 2 hours of light for 1 minute of cranking if you get the right one.