【Advanced Tax & Business Functions】Quickly set tax rates with dedicated TAX+/- keys and simplify budgeting via GT, MU, and memory keys (MRC/M+/M-). These tools enable seamless tax calculations and customizable rate settings for precise, tailored results—ideal for accountants, business owners, and professionals requiring accurate tax computations. 【Visualized Operation Symbol Display】When you would like to calculate the number, it will express the symbol (plus, subtract, multiply, or divide) on the screen. It can help you see the operation steps when you operate continuously. 【Efficient Dual Power System】The calculator uses high conversion rate solar panels, and solar power can be used in well-lit areas. At the same time, we provide a matching battery double safe uninterruptible power supply. The calculator will shut down automatically after 8 minutes without operation. 【Small Size, Large Display & Premium Build】It features a large LCD display with a 30° angled screen for clear visibility, paired with a high-grade metal panel and durable ABS buttons. The ergonomic button curvature aligns with natural finger movements, reducing errors and enhancing efficiency. 【Durable Construction and Portability】 Made of high-grade metal panel and durable ABS buttons, this 12-digit calculator is lightweight yet durable, capable of withstanding multiple impacts from desktop height. The large, clear LCD Display offers crisp, easy-to-read numbers, minimizing eye strain and ensuring professional-grade performance whether at home, in the office, or while traveling.