Nijar Ragan، an Egyptian girl at the 6th grade a primary school، said that has invented a power bank set to charge mobile phones without electricity for 3 months. She added during remarks to Sada El bald، that she competes in Cairo International Exhibition for Invention، that the set was produced by using a motherboard of a car charger and a battery of 9 volt. She invented a button to turn onoff the set. She affirmed that will continue her efforts to improve the set to run by the solar energy along with another battery to run when the sun sets. She affirmed that the new set solves problems of missing a source of electricity.