I didn't purchase this myself and received it as a gift, i do wonder how i managed without it. Being able to recharge a multitude of devises on the go from something so compact is great. Not being the best at keeping my mobile phone charged, this has got me out of trouble a few times. The size has to be one of its best features, i can actually fit it in my wallet. I have just ordered one for my wife. Would highly recommend this product to anyone with a mobile device.