LARGE DISPLAY AND BIG BUTTON CALCULATOR Large 5 Inch and clear 14 digits display screen allows for easy readability and usage, relieving any strain on your eyes.Especially suitable for accountants, supermarket cashier,stockbroker and office etc. 112 STEPS CHECK FUNCTIONSAuto Replay/112 Steps Check/Grand Total/Markup/Memory Clear and Recall/Memory Add/Subtract function keys help with basic and complex calculations. 20 DESKTOP CALCULATOR Screen of this desk calculator is just opposite your sight, make all calculation easy to read. 2 colors separated big buttons,match with your fingers curve, make your every press more accurate and work more efficient. DUAL POWER SUPPLY DRIVE This calculator is driven by solar panels and AA batteries at the same time, so you never have to worry about running out of power. The calculator will turn itself off automatically after about 8 minutes of being idle. HIGHLY DURABLEThis large calculator is made of ABS high strength engineering plastics ,so it can withstand the impact of falling on the height of the desktop for several times.