Welcome to our store! 1. FUNCTION: This multifunction calculator not only has 4 common arithmetic functions, but also supports percentage, subtraction, and addition, memory erasing and recall. 2. LCD DISPLAY: Clear 12-bit digital LCD display, large digital LCD screen, easy to read from a distance, user-friendly, and aesthetically pleasing. 3. ENHANCED PRESSURE SENSITIVITY: The desktop calculator features a scientific design with large buttons and an ergonomic design, increasing pressure sensitivity and providing a comfortable feel. 4. DUAL POWER SUPPLY: The calculator is powered by a dual power supply using solar energy and a built-in battery, making it easy to use and suitable for both office and home use. 5. SAFE MATERIAL: The calculator is made of wood, which is safe and environmentally friendly. The numbers are engraved on the wood, and the 29 buttons will not fade after prolonged use. Item Type: Solar Calculator. Material: Wood. Number of Keys: 29. Production Process: Carving. Working Current: 1.5 A. Operating Current: 4 μA. Battery Type: 300 mAh Lithium-ion Battery (included with built-in battery). 1 Calculator (included with built-in battery). 1 User Manual. Customers are our priority. If you encounter any problems with your product after receiving it, such as damage or an incorrect quantity, please contact us immediately. We strive to provide you with the best after-sales service.