Canon's TX220H calculator saves time and effort in classrooms, homes, and offices. It provides a range of functions for quick calculations and easy figuring of finances. The large, 12-character display is angled to reduce glare and eyestrain, and the numbers look crisp even in low light. Extra-large keys and special functions keys increase your accuracy and calculating speed.The TX220H features all the basics of calculation: addition, subtraction, multiplication, and division, plus a sales-tax key, square root function, sign change, and MU. This portable calculator measures approximately 6.5 by 6 by 1.25 inches and features an automatic power selection that shifts between solar and battery power as needed.