Office Desktop Calculator Basic 12 Digit With Solar Power And Aa, Large Display. Functional Instruction: ON/AC key: turn on/clear M+/M- key: memory plus or minus MRC key: memory total value and clear memory GT key: summation calculation OFF key: turn off MU key: profit and loss operation Item Specifications: Item name: 4 pack calculators Compatible: for everyone, home, office, student Product type: Arithmetic calculator Powerd By: Dual power solar and battery (battery included) Size: 5.7 x 4.7 x 1.8 in (1 piece) Weight: 4 oz (1 piece) Material: ABS plastic Display number: 12 Color: Black and Silver Package includes: 4 x Lichamp Basic Calculator 4 x AA Batteries 1) Large display: 12 digits large LCD display and large numbers, eye-angled, easy to read. 2) Dual power: solar (works only when it is bright) and battery (one AA battery included). 3) Basic calculator: add, subtract, multiply, divide, backspace, % and MU, auto-off when you do not use it about 10 minutes. 4) Wide application: Common math and financial functions, perfect choice for school, office, business and home use. 5) Note: The screen is difficult to read in low light without battery power. Please insert our AA battery for continuous and accurate usage.