28 keys, including numeric and arithmetic keys, are produced by injecting plastic of two different colours Markings of the 28 keys are plastic, which means they do not wear or fade with use Key operations are stored in a buffer, so that nothing is lost even during high-speed input Larger display makes more data easier to read, large rubber feet on the bottom of the calculator keep it from slipping during operation Keys are ergonomically shaped and configured to match natural finger movements Calculator has currency exchange function Power source is solar and battery Keys are durable and anti-fade
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