SHARP EL-377SB Twin-Powered Basic Calculator with Extra-Large Display and Attached Hard Cover - This general calculator is great for day-to-day calculations and more. A great all purpose calculator the EL-377MB can do all of your basic functions as well as calculate taxes. The calculator also switches between battery power and solar power on its own. A little larger than most pocket-sized models (yet still amazingly portable), theEL377SB is extremely user-friendly. It has Percentage, square root&+/- keys, constant calculation Aluminum front panel.