This Texas Instruments ti-83 plus Graphing Calculator is a reliable tool for all your business and office needs. With a regular key size and regular display size, it is easy to use and read. It runs on battery power and is handheld for convenience. The brand is Texas Instruments and the model is ti-83 plus. This calculator is perfect for those in need of a graphing calculator and is sure to meet your needs. Used condition. Marker marking in battery compartment. Does not affect functionality of calculator. One small grip/slide tab is missing on lower right side of cover and back of calculator. Please refer to photos for more details. The TI-83 is powered by four AAA alkaline batteries. Batteries are not included. It comes with a hard slide cover. Tested and working. Calculator has been disinfected. Smoke and pet free home. Ships same or next business day.