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A door handle is the motive of this cell-phone Charger & Cradle & Speaker. Opening and closing door using a door handle is applied. It has an effect of saving electricity with easy on/off, and after charging battery, it goes to off mode automatically that is shuts down stand-bye power. It prevents an unnecessary loss of energy.
KPU Korea Ploytechnic University
Gyeonggi-do, South Korea
Korea Polytechnic University
seoul, South Korea