The Texas Instruments TI-Nspire CAS Touchpad Graphing Calculator is a versatile handheld device that combines large key sizes with basic, financial, scientific, and graphing capabilities. Its touchscreen interface and LCD display make it easy to navigate and use. With features such as USB connectivity, calendar functions, calculus capabilities, and a clock, this calculator is designed to meet a wide range of mathematical and computing needs. Powered by batteries, the TI-Nspire CAS is a reliable and efficient tool for students, professionals, and anyone in need of a high-performance graphing calculator. Used this baby back in college.