For computing with speed and efficiency, the Sharp EL-R277BBK Calculator is the ideal choice. This calculator features a 12-digit slant LCD screen combined with large spaced keys, which lets you compute with ease. With a 100 percent recycled body, this desktop calculator is environment friendly. Advanced functions like sign change, four-key memory, margin, and grand total lets you compute all the difficult problems accurately. What’s more, the dual power mode lets you switch automatically from solar power to battery and vice-versa, which adds to your convenience and productivity.