Key chain solar charger has created to provide power. It is called an emergency power backup since one can use it at drop of a battery or anywhere need of power. Key chain solar charger will take three days to charge up completely in the desert type sunlight. If you live in the darkest area or cool places where sunlight always is dim then another option to charge it up is power socket. One can recharge mobile devices anywhere and anytime whenever he needs power by clean energy. You can charge it by sun light, USB port or AC Adapter and continue journey. It is the best alternative power supply device in the emergency.