The Basics:
Not surprisingly, the Bunker is a fully assembled and pre-cabled unit. The housing and operating mechanism are made of a very durable plastic and the front door has a vented faceplate.
From the top-down view, you can see the USB hub circuit board and the USB connector cable. The back view gives you a better shot of the locking mechanism. To help decrease the possibility of theft, NZXT has gone with a 20 key system - meaning there are 20 different key combinations for the Bunker, whereas most manufacturers use only a handful.
Inserting the key and a quick key twist to the left pops the front panel open automatically. As the door opens, the hub slides forward for easy insertion and removal of USB devices. As was mentioned earlier, you'll need to be mindful of the length of the devices. NZXT has spaced the ports close enough together to allow for four devices, but apart enough that bulkier items can still be plugged in.
The next set of images will give you a better idea of how much space you'll actually have for USB devices. The USB stick in the image is exactly 2 inches long and we'll plug it into the second slot from the right. With a very careful nudge, we get the door closed and a twist of the key, we get the door locked. While this is slightly longer than NZXT suggests, it does work - and will keep your USB drive from wandering away while you're not looking.