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I've found that the fingerprint readers don't work with everyone's finger. I think even when they do work with a given finger they don't seem to work every time. Nothing is more frustrating than needing to get inside quickly and being rejected by a machine.
Battery life has not been a problem but they can cost ~$300 for a good deadbolt.
I've been brainstorming alternatives.
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As for our common defense, we reject as false the choice between our safety and our ideals.
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