Item Type: Calculator Notepad Material: PP Shell, Silicone Product Color: Black Power Supply Mode: Sun Lamp or Button Battery Battery Model: CR1220 3V Button Battery Package List 1 x Calculator Notepad 1 x English User Manual Ships without battery. 1Multi Purpose: The portable calculator is versatile, it is both a calculator and a writing pad, which can be written repeatedly. 210 Digit Display: Calculator notepad uses a 10 digit large screen, and multi digit numerical display improves work efficiency. 3Dual Power Drive: The solar folding calculator is equipped with a solar panel with a button battery inside, which doubles to ensure uninterrupted power. 4Lightweight Portable: 10 digit digital calculator weighs only 128G and is made of light and environmentally friendly materials, making the overall body lighter. 5Clamshell Design: Desktop calculator with 10 digit large display adopts a clamshell design, which is light and easy to fold in half for easy portability.