What happens when a gun safe with an electric key pad runs out of batteries?

Does it unlock? Does it remain locked? I'm thinking of this because I'm a prepper and I'm wondering if I ran out of the batteries would I be able to open the safe. Also wondering because what if in a self defense scenario, I hear a bump in the night and then I try to unlock a safe with home defense guns... show more Does it unlock? Does it remain locked? I'm thinking of this because I'm a prepper and I'm wondering if I ran out of the batteries would I be able to open the safe. Also wondering because what if in a self defense scenario, I hear a bump in the night and then I try to unlock a safe with home defense guns but it turns out the batteries ran out the day before. These kind of situations are why I'm asking this.
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