Great portable external battery!  Perfect size to fit in a pocket or in a backpack while traveling, hiking, sporting events, and shopping.  I don't like shopping but it keeps my phone charged while waiting for the others to finish shopping.  I can charge my Samsung Galaxy III phone from completely dead to full charge and then have enough power to charge up my Nexus 7 tablet to 3/4 power.  Haven't really used the laser pointer and flashlight option, but it's a nice add on to the external battery pack.  You can use the phone/tablet while charging, but it's best to leave it alone and connect it to the charger, you'll be able to get more charging ability on the external battery.