MW-12A model with dual power and a memory function, a liquid crystal display calculator. - Model: MW-12A - Power Type: Dual Power - Display Type: Liquid Crystal - Features: Memory Function - Color: Gray 12 digits Battery: CR2032 Solar Battery Dual Power System The Casio calculator MW-12A is a 12-digit mini-just-size calculator. The main specifications are as follows: Digits: 12 digits Size: Mini-just size Power: Dual Power (Solar/Battery) Main Functions: Four basic arithmetic operations Percentage calculation Square root calculation Memory function Tax calculation Other: Extra-large display Key rollover Auto power off Sometimes the buttons are a bit stiff, but it worked without any problems.