MyLifeUNIT Electronic Desktop Calculator with 12-Digit Large Display, Solar and AA Battery Dual Power Dual Power: Solar and Battery, solar function works even in the dim light. Extra Large 12 digit Display Desktop calculator On and off buttons, auto power off Profit Margin Large 12 digital LCD display: allows you to see the digits from anywhere on your desk Includes dual power: solar (lithium-ion battery) or 1 x button battery (not included), can be powered by solar energy and battery. With the large plastic buttons: you will not hit the wrong numbers anymore. They are really easy to press and make the perfect clicking sound. Durable Shell: Long lasting life and won&#039;t break easily after normal falling, it still can work well. <span class="a-text-bold"></span>1-Large 12 digital LCD Display 2- Solar Power Support 3- Memory Function 4- Zero Clearing/Reset 5-Four Arithmetic Operations 6- On/Off 7-Comprehensive Calculation 8- Back 9-Percentage Calculation 10 -Summation