The Texas Instruments TI-84 Plus Graphing Calculator is a handheld device that is powered by batteries. It is designed specifically for graphing and is ideal for students and professionals in various fields. The new sealed black model of the Texas Instruments TI-84 Plus is a reliable and efficient tool for solving complex equations and creating graphs. With its sleek design and powerful functions, this calculator is a valuable asset for anyone in need of a graphing calculator.