LCD Mini Card LC-20 pocket calculator, a pharmaceutical promotional item from Pfizer/Roerig for Glucotrol (glipizide) diabetes medication. Credit card-sized calculator with basic 4-function operations, memory (M+, M-, R:CM), square root, and percentage. Features LCD display with auto power-off. Includes brown vinyl wallet case and multilingual instruction manual. Made in Hong Kong. Does not power on - likely needs new battery.