1、Versatile Use: This desktop calculator is perfect for home, school, office, or shop use, ideal for both adults and students. 2、Memo Lock & Silent Keys: The compact calculator feels comfortable in your hand and features quiet keys, minimizing distractions. The "Lock" function saves important notes and prevents accidental deletion. It also efficiently performs 4 functions for financial, household, and accounting assistance, including mortgage calculations and tax conversions. 3、Dual Power: Powered by disposable button batteries (lasting up to a year) and a solar panel, you won't have to worry about running out of power, even on the go. 4、Notepad Function: This calculator with a notepad is perfect for minimalism and going paperless. Take notes during calculations, calls, and meetings to improve learning and productivity. 5、Eco-Friendly: The LCD writing pad is designed without blue light to protect your eyes and can be rewritten over 50,000 times without ink or dust, reducing paper consumption and promoting environmental friendliness. Item Type: Calculator Material: ABS+LCD Battery: Button Cell CR2025 (built-in) Capacity: 150 mAh Power Supply: Battery / Solar Size: Approx. 150x90mm/5.9x3.5in Notepad Size: 6 inches Number of Digits: 12 Includes: 1 x Calculator 1 x User Manual