I already owned one of these and my fiancee asked me to buy her one as well. It's brilliant because nowadays' tablets and smartphones, although have really large batteries, can't cope with intensive usage - let's say you decide to visit a big city and you'll use Google maps and/or a GPS navigation - thus also intensive use of the screen - it'll drain up pretty quickly. Now this is where this little gem comes in. Because of the very high Amp output, it is actually capable of charging your phone faster than the wall socket charger (which is only rated at a max of 1.0A). Add to this the absolutely amazing capacity and you'll end up with a thing that's almost as heavy as your smartphone and will provide juice for the whole day.