I travel by air frequently and game with my phone so there's never enough battery to last through a trip...until now! I went internet surfing for an extra phone battery and found this on Amazon. This little unit (it's smaller than the phone) packs a ton of extra energy. It comes with all the hook-ups you could possibly want to charge it and then hook it up to your phone. The amount of charge in the unit is huge! so that you don't have to recharge it every time you use it. When I use it to charge/run my phone while I'm gaming, I hook it up and then just hold it in the same hand just tucked underneath my phone. It works very well.