Desktop Calculator 12 Digit with Large LCD Display and Sensitive Button, Solar and Battery Dual Power, Standard Function for Office, Home, School [GIANT CLEAR DISPLAY] - Large 5 Inch and clear 12-digit display screen allows for easy readability and usage, relieving any strain on your eyes. [USEFUL FUNCTIONS] - Grand Total/Markup/Memory Clear and Recall/Memory Add/Subtract Function keys help with basic and complex calculations. [LARGE EASY TO USE DESIGN] - Large buttons and Easy To Read Display make it simple and convenient to use, whether at home or the office. [EFFICIENT ENERGY SOURCE] - Dual solar energy and battery power sources give this product a long-lasting battery life, so you never have to worry about running out of power. Also has Auto Power-Off. The calculator will turn itself off after about 6 minutes of being idle. [HIGHLY DURABLE] - Well built and durable plastic keys allow for constant use without any wear and tear, giving you the feel of quality. Note: Battery not included