I found this a week before I left for Austin, TX. I wanted something to plug into my iPhone so I could watch movies on the plane. I received the item and was excited to see the additional adapters it had. I realized I could also charge my camera if need be while I was out and about. I got on the plane and plugged it in. I successfully watched 3 movies roundtrip from Milwaukee, WI, to Austin, TX, and back - and with no change to the actual iPhone battery. While I was in Austin, I did have to recharge my camera battery. We were on the road and I had this in my purse, so I plugged it in - the IMP500 charged my iPhone right up! Both my sisters have iPhones and while we were at a restaurant, one of them used it too. They could not beleive it! To make it even better, my friend was over the other day with her LG phone and it died. She was so upset because she had places to go and no cell phone. I checked the adapters and one of them that came with this battery fit into her phone. I was able to charge her phone while she visited. In an hour, her battery was full and the battery meter on the IMP500 didn't even budge. I highly recommend this device to anyone. It's great to have, it is going to be wonderful on our trips this summer, and it is a quick saver when you need it most. I am shocked at how well it has performed!