Like all the other portable chargers in the pebble range the ministick has a built in usb output so all you need to do is plug in your smartphone charging cable and youre ready to go the pebble ministick has an 1800mah capacity battery which is enough to give your mobile device an emergency additional charge then simply recharge your pebble ministick via the micro usb port and the supplied charging cable ready for the next occasion you need a power boost the pebble ministick has a sof