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• ♪DUAL POWER♪: The desktop calculator is powered by a dual power supply consisting of solar panels and one AA battery (1 AA battery included) for long-lasting performance and is unaffected by power interruptions during use. (NOTE: Some users may use the calculator early in the morning or at night. The screen may be difficult to read in dim light without battery power. Please install our AA battery for continuous and accurate use.)
• ♪RESPONSIVE BIG BUTTON♪：The large calculator has environmentally friendly large plastic buttons that are more suitable for your fingers, feel comfortable, and respond quickly.
• ♪ COMFORTABLE ANGLE & LARGE DISPLAY♪: The calculator is designed with an elevated head, so the display angle of the screen conforms to human visual habits. The screen adopts a 12-bit LCD display, which can easily and clearly display the screen content.