In the world full of gadgets it is important to make sure that do not run out of charge and instead of carrying a powerbank you can put on this SOLSOL Solar Charging Hat and it will charge your phone or tablet. It is battery free, so it does not emit any Electromagnetic Radiation. The SOLSOL Solar Charging Hat is capable if charging any Android Devises, iPhones, iPads and almost anything that connects to a USB port.