This basic calculator features integrated calculation and note-taking capabilities with a stylus pen. Without the need for paper, you can write and calculate simultaneously, enhancing learning, productivity, and convenience. The calculator with notepad includes an upgraded LCD screen with green-highlighted writing. It has a built-in CR2025 battery and offers one-key lock and one-key erase functions. Handwriting thickness adjusts based on screen pressure, allowing you to record calculations instantly for efficient performance. Suitable for business, accounting, home, and school use. Powered by both solar energy and battery (AA batteries included), this device ensures reliable operation. The replaceable battery provides backup, while solar charging helps prevent power loss. Lightweight and portable, the calculator writing pad can be carried easily and used anytime, anywhere. Ergonomically designed keys are sized for comfort and offer sensitive, durable performance. When placed on a desk, the screen is angled at 30 degrees for optimal viewing, reducing neck strain during extended use and improving clarity and work efficiency. Color: Black Material: ABS Package Contents: 1 x Calculator with Notepad Note: Light reflection and display differences may cause slight color variations between the image and the actual item. Measurement tolerance: +/- 1-3 cm.