Some reviews seem to be over analyzing this smart little product, which is stylish, discreet, and surprisingly effective. No, it won't hold enough charge to jump start your uncles 1986 Rover, and it's not designed to make you "throw away" your plug in, or 12v chargers. What it will do is trickle charge your iPhone, iPod or other compatible Apple device and top up, or help maintain a full charge, as long as it is reasonable sunny. Obviously this will work better in the middle of the Sahara, than down town Manchester, but come on folks! Stop complaining. For the price it's great. Easy to use, works, and looks good - what's not to like? Not even available in the US yet, where you will have to carry around a solar panel backpack or window mounted bigger version, this is just the ticket. Not perfect by any means, but still 4 stars.