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Gotcha. I was curious because I know you can buy a USB one for like 30 bucks or something like that. What about advancements in that technology. It says a lot that the technology has hit the common market, along w/ retinal and iris scan tech. What kind of tech development time before it is the quickest. 5 years? 10? 25? It would seem very easy to widely integrate the technology.
Every good one that I have seen still has an unlocking key that also comes with the safe or door. Batteries also run down for the electronic part.
They also have a four digit numeric code that you enter to activate the fingerprint portion of the unlocking procedure. That way an intruder needs more than a cut off finger to get what they want.
I have some biometric locks and they are pretty good....I wouldn't hesitate to get another one.