Neewer 3 LED Light Solar Power Charger for Mobile Phone Nokia This solar mobile charger is a standby power supply used on various occasions such as business trip, traveling, and field work. The solar panel transfers solar power into electrical energy which is stored in the built in 600mAh lithium battery. In-output bi-directional power management, auto-protection function works when charging. Equipped with a variety of charging adapters for different cell phones: iPhone, Samsung, HTC, Nokia etc. In addition to being recharged via solar power, this battery pack can be recharged via wall plug with AC Charger or USB Port of a computer.These two recharging mode are designed for continual overcast days when there is no sunlight.