The safe is mounted with four bolts on the inside to the studs (so that the safe can’t be removed when it’s locked):
And when it’s all done and programmed with your fingerprints, you’ve got a nice clean wall safe that can be hidden almost anywhere (although, with this particular safe, the fingerprint scanner sticks out pretty far, so it wouldn’t fit behind a painting, for example).
I assume this is true of most safes with electric locking mechanisms, but before I ordered it the thought crossed my mind: what happens if the batteries die and the fingerprint reader stops working? The answer is that the safe comes with a battery pack that you put a few AA batteries in, and plug it in under the fingerprint reader. This allows you to provide external power long enough to replace the batteries on the inside.