The Casio MX-12B is suitable for daily use, whether you are studying for mathematical qualifications, working on complex financial analysis, wanting time saving desktop assistance or looking for handy calculations whilst on the move. It has a large and clear 12 digit display, with dual power it also performs all the main basic functions. It has an extra large + key, a square root key, change sign key and it also incorporates a 4-key memory function and a Mark up Key (MU). A powerful and rugged mathematical tool, built specifically for your task at hand. 12 digit display Dual powered (solar with battery backup) Percentage Calculation 3-Key Memory 3 Digit Comma markers Function command indicator Key for changing plus/minus sign Battery Back Up: 1 x LR1130 Dimensions (WxDxH): 107x147x29mm