12-bit real solar calculator large screen dual power supply financial accounting desktop computer office supplies
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The difference between the two calculators:
The 837 calculator is powered by solar energy or one AA battery (dual power supply), while the TH voice calculator is not solar-powered and requires two AAA batteries. Both calculators are battery-free; if you need batteries, please purchase them separately.
②The 837 calculator is silent, while the TH voice calculator offers real-person voice counting.