The ECC210 Calculator manufactured by Citizen is a programmable scientific calculator with a 10-digit display and 256 Kb of memory. It features a built-in scientific library, which includes trigonometric and exponential functions, as well as statistical and graphing capabilities. The calculator also features a two-way power source with a lithium-ion battery and an AC adapter for maximum battery life. The calculator has an advanced statistical analysis feature that allows users to quickly analyze data sets for means, standard deviations, and correlations. Additionally, the calculator supports both standard and matrix operations, allowing for quick calculations and problem solving. The Citizen ECC210 Calculator is a great choice for students and professionals who need an advanced calculator with plenty of features.