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CIRKIT is smart phone charger, combined with supplementary battery. This digital smart charger contains double battery cells in its body, so user could charge their smart phones and supplemetary battery at the same time.
University of Seoul
Seoul city, South Korea
Kyumin Ha,
University of Seoul
Sewon Jung,
Hongik University
Yongjae Park,
Yonsei University
Songyee Kim,
Sungshin Womens University
