I bought this power bank for our fishing trips that can last over 12 hours in a single day. We are outside which means no access to electricity and no way of charging our phones. With this power bank, I am able to charge 2 devices at once (mine and my husband's), so I do not need to buy multiple power banks. My phone is fully charged in under an hour, and I am able to charge my phone multiple times. Overall, the power bank does not look nor does it run like a cheap power bank. As far as size, it is about the thickness of 2 thin phones that are stacked on top of each other. Therefore, I can easily put it in my purse or leave it in my hiking bag.