Best full size deluxe super view calculator with so many features. It operates on Battery or AC Powered. It comes with AC Adapter. You may need to replace the ink roller soon, which you can get from staples or dollar store for a few dollar. In excellent condition. Here is web link to ful manual instruction https://www.manualslib.com/products/Texas-Instruments-Ti-5033-Sv-6426417.html