This second pictures shows the inside, complete with color video screen. This is a long way from us generation x-ers having to simply ride in the front of the grocery cart, legs dangling, with a seat as hard as a rock!!! I wasn't even allowed to hang on the side of the cart. Even if that was the cool way to grocery shop with your parents, that was too dangerous.
The doors lock to keep the kids from falling out, and you can keep the grocery cart for as long as it takes for you to finish your shopping. From what I understand, you have 5 minutes after checking out to return the unit. After that 5 minutes, the brake locks up on it, and you cannot push it anymore. Yeah, its a small pain to carry all of the groceries to the car (or transfer them to another cart), but the peace and quiet during the shopping process is priceless!!