EL-326SB Basic Calculator, Eight-Digit LCD Twin power solar cell and LR1130 alkaline maganese battery Automatically switches from solar cells to battery power in low light. Easy-to-read, large LCD, FEM type liquid crystal display. Easy-to-operate extra-large plus key, independently accessible 4-key memory to store/recall figures, fully floating decimal point. +Tax/-Tax, and % keys. 7-minute auto-off. Flat viewing angle. Includes operation manual. 2-23/32" x 4-17/32" x 1/4", 2.1-oz.