I have confirmed that all the buttons and other controls are working properly through gameplay. The front of the shell is a skeleton (clear shell) design, making it a very cool product. I believe there is almost no yellowing on the screen, but this is subjective, so please check the images and make your own judgment. The battery cover is a compatible (non-genuine) one, and there is a slight difference in color and texture. Please refer to the images for other minor scratches and scuffs. ⚠ This listing is for the main unit only. Please note that software for testing, memory sticks, chargers, and batteries are not included for safety reasons. This is a used item, a vintage game console, and has only been briefly inspected by an amateur. To prevent any issues, please only purchase if you understand and agree to these conditions.