When it comes to having a convenient and safe charging external power bank for your smartphone and other compatible devices, then this powerful coolnut 13000mah portable charger dual usb output solar power bank is the best option for you. This high performance good quality power bank holds enough power to charge your devices at a maximum of 2a output, making it super handy to have around if you're low on battery with no outlets in sight. It features innovative and additional solar panel system that recharges the power bank through direct sunlight in a few days of time. It also comes with another input charging port for convenient electric recharging. Another notable feature of this solar solar panel power bank is that it is powered by li-ion cells which are the safest in the world. The beautiful looking shell case made with the good quality aluminum+abs material, comfortably fits in hands giving an elegant and royal look.This environmental-friendly portable power bank is unique in its own class and gives complete durability that makes it a perfect partner for a trip. As a symbol of high utility, it features 4-led indicators that show charging status and an led flashlight. Apart from that, this external battery charger has a multilevel security system for short-circuit, high-voltage and over-current risks. It also features auto-cut charge as by this technology, the device will automatically shut down in the case of a short circuit to protect your device.