Solar & Battery Dual Power:The solar design make the calculator can work in daytime or even in the dim light without battery (AAA battrty not included). Material:This calculator is made of ABS high strength engineering plastics, light weight but durable. It can withstand the impact of falling on the height of the desktop for several times. Enhanced LCD Display Screen: We use the specially modulated pigment for the display screen which improves the clarity of the display screen greatly.large LCD display and tilted screen is so easy to read from afar. 12 Difits Calculator:12 digits make the calculator best suited for large calculations. Suitable for any businessman, worker, teacher, student or anybody who needs make any sort of calculation from time to time. Functionalities: In addition to the basic standard functions of calculators, add new features: RARE, TAX-,TAX+. This calculators with tax function are very suitable for offices, businesses, schools, stores, shopping centers. Large, Eye-angled, 12-digit Upright Display. Two-way Power: Solar and Battery On and Off buttons, Profit margin %, +/- , , Key Rollover. Percussion keyboard ergonomic design, clear sound, after 100 thousand times of tapping test, not easy to bond. Easy to Carry, This Handheld Desktop Calculator, perfect choice for office and home.