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You may have difficulties finding sockets even though you have a phone charger to charge your phone and if you can not find a wall socket you may have to connect it with your laptop which you need a jack, not the charger. Therefore, the portable charger that can also work as a USB port is invented. It functions as a secondary battery because each charger has an electric condenser. Once it is plugged in, it recharges itself anytime and anywhere. In each circumstances, you can use through the assemble. charger, which is easy to carry without a bag. integral functions of spare battery with charger.
hannam university
Daejeon, South Korea
hannam university
Daejeon, South Korea
Won Sock Kim
hannam university
127 - 1401, South Korea
Yong Hwan Moon