Quote:
Originally Posted by GH85Carrera
What happens when the batteries die?
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You change them.
With the one I have, it will flash a light at you for quite some time alerting you to change the battery. You'd have to ignore it for a long time before losing power.
Some also use a key as a backup as well. The battery is changed from the secure side of the door, so as long as you have key access to that area via a back up system, or some other access to the secure side of the door, you won't have an issue.