【High-Function Calculation】 The CASIO fx-915ES is a high-function calculator that makes complex calculations easy. With its Natural Display function, it displays formulas as they are, making them visually easy to understand. 【Convenient to Carry】 Its lightweight and compact design makes it easy to carry to school or work. A dedicated case is included for complete protection. 【Various Functions】 Equipped with a variety of functions, including statistics, trigonometric functions, and exponential calculations, it meets the needs of a wide range of users, from students to professionals. - Brand: CASIO - Model: fx-915ES - Power Source: Dual power source (solar and battery) - Color: Black - Case Color: Gray I have confirmed that all the buttons are working. It has been wiped and disinfected, but as it is an old product, there may be some scratches and stains, so please understand. Please purchase only if you understand that it is a used item and has been stored by a private individual.