Do not worry about your devices running out of juice while you are out doing errands by having with you the key-chained mini power bank. This power bank is equipped with an 1800 mAh lithium polymer battery that gives an output of 5 Volts/1 Ampere through its USB port. If this power bank runs out of battery, you can easily recharge it through its micro USB input port that receives 5 Volts/550 milliamperes. Be assured that carrying this power bank is easy with its built-in key ring that attaches to bags, loops, and the like.