Features 1、CARVING CRAFT: Wooden calculator is made of fine carving process, the numbers are engraved on the keys and will not disappear after long time use. 2、ERGONOMIC KEYS: This calculator adopts scientific large key design, which conforms to human habits, increases pressure sensitivity, and is comfortable to touch. 3、LARGE SCREEN: The 12 digit LCD screen that clearly displays large numbers is easy to read from a distance. Compact and beautiful, easy to carry. 4、DUAL POWER SUPPLY: This calculator is powered by both solar energy and built in battery. If it is not operated for 5 minutes, it will turn off the power automatically. 5、MULTIPLE APPLICATIONS: 18 buttons, very practical. This calculator is perfect for office, business, student, store, mall daily and home use. Specification Item Type: Calculator Material: Bamboo Wood Number of Keys: 18 Keys Production Process: Carving Operating Current: 1.5A Operating Current: 4μA Battery Type: 300mAh Lithium Ion Battery (Built in) Package List 1 x Calculator 1 x Instruction Manual