The Texas Instruments TI-89 Titanium Graphing Calculator is a handheld device perfect for students and professionals alike. With a regular key size and display, this graphing calculator offers a range of features including an LCD display, USB connectivity, backlight, calculus functions, clock, and programmable capabilities. Powered by batteries, this model from Texas Instruments is a reliable and efficient tool for solving complex equations and graphing functions. Included with a cover, this calculator is both practical and stylish for office or classroom use.