Every single Texas Instruments TI 83 Plus calculators were tested and works 100%! The calculator displayed on the pictures provided represent the similar conditions of all 30 TI 83s listed. There are no major flaws at all! You will not receive a calculator that has a bruise, crack, or damage screen. The sliding cover and battery is included. Don't purchase a calculator that cost 100 or more. This calculator does the same function when it comes to graphing and computing mathematics for many courses. Don't miss out on this opportunity! Upon your purchase, I will offer FAST AND FREE shipping! What more can you ask for :)