This little guy has saved my bacon on more than a few occasions. It's small enough to fit in your pocket, yet packs a whopping 5000 mAH battery to rescue your power hungry smartphone or any other usb powered device! Ideal for anyone who travels and needs extra juice to get them thru a long flight, or drive. The construction is solid, and the button is NOT hard to push, as some reviewers have said. I would buy this again without