The Emergency Device Charger is a unique power bank. It is designed to be used with batteries and does not need to be charged prior. All you need to do is input two AA batteries and you can charge most devices with a USB cord. This can be more preferable to standard power banks if you need to charge many items with a lot of energy while on the go. Unlike most power banks, this item’s charge limit is only limited by the amount of batteries that you have on hand. It is also great for emergencies because it relies on batteries and not on a wall outlet. •Charges most devices with a USB! •Requires 2 AA batteries (not included) •Multiple Color Imprint: Available on White