【Large Display and Big Button Calculator】 Having large size in display screen and buttons, this large calculator is very easy to use and read, especially suitable for accountants, sales or any other business man to use in office, store, market etc. 【30°Angled Desktop Calculator】 Screen of this desk calculator is just opposite your sight, make all calculation easy to read. 3 colors separated big buttons, made of ABS plastic, match with your fingers’ curve, make your every press more accurate and work more efficient. 【Operation Symbol Visualized Office Calculator】When doing calculation, this large button calculator will express the operation symbols (plus, subtract, multiply or divide) on the screen, help you seeing the operation step when you operate continuously, so you can easily check and correct your input. 【Dual Power Solar Calculator】Solar and battery both provide energy for the calculadora. When the battery runs off, solar panel will provide back-up energy for you to use the calculator, keep you away from embarrassment. It will turn off automatically after 8 minutes when stop using, prolong battery's life, while reduce power consumption. 【ABS Engineering Plastic】This 12 digits calculadora 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.