Materials: Plastic Shade: black 1: Widescreen show, meet each day massive calculation wants, massive display screen and font to obviously observe the calculation outcomes 2: Acrylic board safety show panel, shield the display screen, not simple to attract 3: With quite a lot of capabilities, capabilities, customary distinction, coordinate conversion, knowledge modifying, steady calculation, reminiscence operate, error correction operate 4: Use a plastic button, clear quantity, snug, not simple to put on 5: Energy provide with the button battery, is enough, lengthy service life 6: Slide the protecting cowl, the duvet could be break up, up and down, is backover
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