This is the 12-digit silent touch calculator, CASIO DS-20K. It features 2-WAY POWER. The internal button battery was dead, so I replaced it with a CR2032 I had on hand. (Replacement date: October 30, 2025) (Replacement battery: CR2032) This item has been stored for a long time, but its operation has been confirmed. There are some scratches on the LCD screen, so the price has been reduced accordingly. #CASIO #Calculator #DS-20K