LARGE BUTTON: Solar Calculator is made of bamboo wood in a rustic style. The numbers are engraved on the bamboo block and will not disappear. The scientific design of the large buttons is in line with human habits. LARGE SCREEN: The functional desktop calculator is a 12-digit LCD screen with clear display of large numbers, easy to read from a distance and convenient to use. DUAL POWER SUPPLY: Desk Calculator uses dual power supply of solar and battery, which does not need to be replaced for at least two years. If it is not operated for 5 minutes, it will automatically shut off the power. LIGHTWEIGHT AND DURABLE: Bamboo Desk Calculator is made of new durable material, bamboo wood carefully carved, small and beautiful, easy to carry, 18 buttons, very practical. WIDELY USED: Bamboo Wooden Solar Calculator is a paperless calculator, perfect for office, business, students, stores, malls daily and home use.