Usable as an AC adapter in a house and as a mobile battery while out, AC adapter built-in mobile battery charges a smartphone anytime and anywhere. Its 180° foldable plug can fit in an even tiny space of a table tap. Adapting pass-through charging method, first priority is in smartphone charging, and when the smartphone reaches full charge, automatically starting charge of its inside mobile battery. It achieves 2,000 times of charge cycle, which is the usable time as a mobile battery by our unique charge control technology. Slim type, considering a good grip with smartphone.