The TX-220TS is the perfect calculator for any office. Attractive and stylish look Large color coded key top Once you use it, you will be amazed at how easy it is. This handheld display calculator features large letters, easy to read and angle adjustable LCD, and great calculation. It has tax calculation, profit percentage calculation, gross key and decimal position functions(A, 4, 2, 0, F). Dual power supply function with solar battery and battery Can be used in low light conditions.