I've got a couple of Viatek ones(came in a three pack)only have four LED's each but they are water resistant(?) and can be used with AA batteries,the crank-1 minute of cranking gives more or less 20 minutes of light and has a hole for an adapter(which doesn't came with it)They aren't going to turn night into day but seem to work rather well.I haven't had them too long but they survived a single camping trip so far-look to me though that they are designed to be hung around a camp sight or used during power outages-which I guess is why they come three in a pack.