Usage Scenarios: Desktop calculators are ideal for home, school, office, or shop use and perfect for adults and students. Memory Lock Function & Silent Keys: The compact calculator keys feel comfortable in hand and operate silently when pressed, making them less likely to disturb others. The "Lock" button function saves your important notes and prevents accidental erasure. It also performs efficient 4 functions for financial, household, and accounting help with mortgage calculations and tax conversions. Dual Power Supply: Powered by disposable batteries, one lasts an entire year, and the desktop calculator also features a solar panel so you don’t need to worry about running out of power even when on the go. Note-Taking Block Function: Calculators with note-taking blocks are perfect for minimalism and going paperless. You can take notes during calculations, calls, and meetings to improve learning and productivity. Environmentally Friendly: The LCD keypad is designed without blue light to protect your eyes and can be written over 50,000 times without ink or dust, reducing paper consumption and being eco-friendly.