I don’t know about you, but I love hiking, backpacking, camping, being in the great outdoors, messing with Sasquatch, and avoiding all other responsibilities. That’s why SunJack is such a great product! All you have to do is be outside and you have a portable way to charge any electronics you may have. The 8000mAh battery charges in 5 hours and has enough juice to charge up to 4 phones! Now that is efficiency. Thank you Sun!