Item Type: Calculator Writing Tablet Material: LCD, ABS Color: White Product Size: Approx. 16 x 9.3 x 1cm / 6.3 x 3.7 x 0.4in (Manual Measurement, There is a Small Error) Battery Type: Button Battery (Built-In Battery) Battery Model: CR2032 Battery Capacity: 240mAh Voltage: 3V Package List 1 x Calculator Writing Tablet 1 x Stylus 1 x User Manual Ship with builtin battery 1Calculator and notepad are integrated design, you can take notes and draw while calculating, which can improve study and work efficiency. 2No blue light LCD screen protects eyes. And can write repeatedly, reduce paper consumption, and environmentally friendly. 3The calculator supports the calculation of up to 12 digits. Below the calculator is a writing board, which is very convenient for taking notes. 4Small in size, easy to carry, and you can put this calculator in your pocket, which is convenient for taking phone calls, notes, and meeting minutes. 5Made of highquality materials, and this calculator is sturdy, durable, not easily damaged, and has a long service life.