1. biometric gun safes 2. including 6 unique users 3. back up mechanical key available FeaturesStores multiple users' fingerprints up to 6 unique usertemplatesConstructed of heavy-duty materials - 17 gauge steelconstructionNRA official biometric gun safety deviceFingerprint recognition takes less than one secondRetains fingerprints when batteries dieOperates on 4 AA batteries (not included) ...