Charging the Power Bank with solar energy through the internal panel is very slow due to the limited size of the solar panel. The solar panel is mainly used for LED emergency lighting. Under even and strong light irradiation, the product needs to be charged by solar energy for about 1 hour to provide power for the LED light for about 1 hour.CHARGING WITH THE CRANK HANDLETurn the crank evenly to generate power from the built-in dynamo. A red status LED lets you know when the battery is charging. Useful for natural disasters, power outages, isolation or wilderness survival.ECO-FRIENDLY CHARGING VIA SOLAR PANELCharge the powerbank eco-friendly with the energy of the sun. Simply hold the solar panel up to the light. The red status LED shows you when the battery is charging.CHARGE VIA USB-C & SAFETYWe use only certified cells and short-circuit proof charging electronics with overcharge and deep discharge protection. In addition, each power bank undergoes an independent safety test before shipping. You can quickly charge your power bank via the USB-C port using the included cable (wall charger not included).CLEVERThe silicone cover prevents water and dust from getting into the ports of your 4smarts Solar Prepper Power Bank.STATUS INDICATORLED lights on the back of the battery let you know how full the battery is and whether the power bank is being charged.HIGH CAPACITYYou no longer have to worry about power outages. The powerful 12000mAh lithium polymer battery provides enough capacity to power your mobile devices.