1, 22 digits LCD display double lines
2, Faster calculate than commen calculator (No need operate + - 0 +/- = and decimal. When you account)
3, Auto Replay the calculation step by step, as check the input digits wrong or not.
4, Double storage
5, Can account Mixed arithmetic of add, minus, multiply, dividing together
Eg: (110+220)multiply(330+440-550)dividing(660-770+880)
6, Input digits from left or right
7, Color: Dark-green/silver/black/blue
8, Battery: 550Ma, solar battery optional