[Two-way Power] - Solar (works only when it is bright) and Battery (included,long battery life.). Automatic shut-down, energy saving and environmental protection. [Display] - Displays up to 12 digits Extra-large LCD display., humanized 45-angle display design, to ensure that the human body does not feel tired during long-term use. [VERSATILE PURPOSES] - This calculator is designed for many occasions: business, office, home, basic budgeting, school, and more. Use it to assist your personal finance or just a quick calculation session. [Functionalities]- Add, subtract, multiply, divide, backspace, grand total, CE, %, M+/M-/MRC. The calculator will turn itself off after about 6 minutes of being idle. [High-Quality After-Sales Service] - Each product has undergone rigorous testing, and quality problems are guaranteed for free for 1 year. If you have any questions, please contact us directly. Project Details: - Project Name: Solar Calculator - Compatible: suitable for everyone, home, office, student - Product Type: Arithmetic Calculator - Power supply method: solar and battery (battery is not included in the product) - Size: 4.72*5.31 inches - Material: ABS plastic - Number of monitors: 12