SCIENTIFIC CALCULATOR WITH NOTEPAD: Includes a 6.5 inch writing tablet and a stylus pen, so you can seamlessly take notes while calculating. Notes can be easily deleted with a delete button or locked for future reference. COMPREHENSIVE CALCULATION FUNCTIONS: Offers 417 functions including fractions, statistics, complex number calculations, linear regression and more, making it suitable for students and professionals alike. ENHANCED KEY SENSITIVITY: High quality plastic keys provide higher sensitivity and precision compared to silicone keys, ensuring a comfortable and efficient user experience. DURABLE POWER SUPPLY OPTIONS: Powered by a solar panel and a replaceable button battery, providing reliable performance and long battery life for uninterrupted use. USE SCENARIOS: - In class or study sessions, solving problems while jotting notes on the built-in notepad. - Professional data analysis or engineering tasks with on-device note capture. - Travel or field work where solar charging helps reduce downtime and extend use.