Users can keep their portable devices charged with the Power Boost Universal battery by mophie. Compact and easy to carry, the Power Boost battery will keep a smartphone or tablet charged when users most need it. This is the companion portable devices just can't live without. Connect any smartphone or tablet to the Power Boost battery USB port and press the status button to start charging. The LED battery indicator tells users the Power Boost battery charge level. Recharge Power Boost battery by plugging the included Micro USB cable into a USB wall adapter or Laptop.