there is a system of 8 miles worth of conveyors within this one building. and some of these belts go about 25 miles per hour. they are moving them speedily to get them out of here. and even if you live close to one of these facilities, it doesn't mean that what you are ordering is coming from there. they have an efficient system of getting things to you. this is scott with amazon. part of what's important here is the labeling. tell me about this part here. >> as the packers are putting the items in the boxes for the customers, the last thing they do is apply the white label. and what that tells the computer is where does this need to go, what's in the box and who needs to get it how fast. the system measures the weight of the box and decides, okay, we need to print a label, apply it to the box, get it on the correct truck at the correct time. >> reporter: the fourth quarter is important to retailers, you have on average 426 orders per second. >> that's correct.