Introduction to electronic locks : Locksmith

Hello everyone, don’t know if it’s the right sub but, I’m trying to understand something about electronic locks, types etc..

I would like to buy lock with a keypad or fingerprint but in combination with physical keys. I’m looking for an european cylinder, all I find online are locks that don’t have a key acces for backup in case the battery runs out or the sistema fails.

Hope someone could help me.

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