I bought mine at the Apple Store, I can guarantee you that you won't regret buying this! Sure it might charge a tiny bit slow, but for it's size it sure does pack a punch. If you constantly find yourself out with your friends and your iPhone/iPad dies then this is the gadget for you! It will give you about a 40%-65% battery boost based on how many things you have running at once on your iOS device. The USB cable folds up inside of the product, and it has 4 lights that indicate low full or low the battery is. I would recommend that you only use this if you completely drain the battery then charge it all the way up, and then drain it all the way etc... All in all this is a very good product and is well worth the price.