This 4500mAh Solar Power Bank is a Portable Power Bank with Solar Charging Polycrystalline technology that supports 1A and 2A output.Let the Sun Become Your Power Outlet.Stay charged， stay renewable， and keep the sun on your side. You will never need to find an outlet to charge your cell phone again once you have this portable power bank. Simply go outside and enjoy nature - no need to worry about your electronics dying while you are out there. Bring along this 4500mAh Solar Power Bank on picnics， to meetings， to the park， and in every day life. It really is the most convenient way to charge your phone. Plus it's cool! Be one with the sun.