This solar charger power bank uses polymer batteries. The performance is excellent. Safe and practical, especially when traveling. The solar panel can make full use of solar energy. Convenient and environmentally friendly. Has 2 output ports, allowing you to charge two devices at the same time, or share your backup power to your friend. Not only is it possible to use the solar panels to charge it, it is also capable of charging the battery via direct electric current. 4 pcs LED indicators for power and 6 pcs LED lighting, powerful and practical. High quality, easy to use, and energy saving.