Feature: 1. Calculator and notepad are integrated design, you can take notes and draw while calculating, which can improve study and work efficiency. 2. Supports 12-digit calculations, and the notepad can be used as a cover to protect the calculator from dust. Press the transparent button to erase the note and protect information. 3. Has foldable design, small and easy to carry, you can put this calculator in your pocket, and quickly take this calculator out and use. 4. No blue light LCD screen protects eyes. And can write repeatedly, reduce paper consumption, and environmentally friendly. 5. Uses high-quality silicone buttons and feels comfortable. With silent design, and is suitable for office, study and various usage scenarios. Specification: Item Type: Calculator Writing Tablet Material: LCD, ABS Color: Black Product Size: Approx. 15.1 x 9 x 1.3cm / 5.9 x 3.5 x 0.5in (Manual Measurement, There is a Small Error) Battery Type: Lithium Battery (Built-In Battery) Battery Model: 402020 Battery Capacity: 120mAh Product Features: 6in Handwriting Board, No Sound, 12 Digits Display. Package List: 1 x Calculator Writing Tablet1 x USB Cable1 x User Manual1 x Stylus Note: Ship with built‑in battery