Features: 1.Notepad Function: The calculator combined with the LCD writing pad is perfect for minimalism and paperless. You can take notes while calculating, talking, and in meetings to improve learning and productivity. 2.Multifunctional Design: The "lock" key feature saves your important notes and prevents accidental deletion, and effectively performs mortgage calculations and tax conversions for financial, family, and accounting assistance. 3.Environmentally Friendly: The LCD writing pad is designed without blue light, effectively protect your eyes and can be written more than 50,000 times repeatedly without ink and dust. 4.Comfortable Pressing: The compact calculator keys are made of high strength ABS plastic, which is comfortable to touch and quiet when you press them, making them less likely to disturb others. 5.Dual Power Supply: Scientific calculator is powered by batteries and solar panels, so you don't have to worry about running out of power even when traveling. specification:Item Type: Office Calculator Material: ABS, LCD Battery: button cell CR2032 (built in) Capacity: 170 mah Power Supply: Battery, solar Number of Digits: 12 PackageList:1 x Calculator 1 x User Manual