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This is a solar-powered calculator that is only a credit card size. It looks like it wasn't on the abacus used in China in the past. Yes, this solar-powered calculator's design feels like a plate, nostalgic and with modern technology. Above it is designed a solar panel that collects solar energy as a power supply for calculators. The beads above are touched, and the digital display is the same as the abacus. In addition to the differences between the Beads' creative points, it is not exactly the same as the solar calculators that Doulex uses.
Qingdao Friend New Energy Development CO.,LTD , http://www.friendtyres.com