BoxCave Bamboo Solar Environmentally Friendly Calculator Comes with BoxCave Microfiber Cleaning Cloth Protects the Earth. Eco-friendly decomposable bamboo material Large 12 Digit display  A handy tool to get you through everyday workflow Solar power - Function with the dimmest indoor light possible Powers off automatically after 12 minutes of inactivity Comes with BoxCave Microfiber Cleaning Cloth