The Texas Instruments TI-89 Black Scientific Graphing Calculator is a handheld unit with a regular display size, powered by batteries. It is a scientific calculator designed by Texas Instruments, ideal for various mathematical and scientific applications. With its compact size and key size, this calculator is portable and convenient for use in educational settings, business, or industrial applications. The TI-89 model is known for its reliability and functionality, making it a popular choice among professionals and students.