These Biometric Vaults use fingerprint recognition technology to keep out intruders. Outside is constructed of 16-gauge steel with a tamper-proof spring-loaded door. Soft foam on the inside protects valuables. The Biometric Mini and Multi Vaults use a high-performance self-learning algorithm to achieve fast identification of enrolled fingerprints, reduce false reject rate, and learn from slight changes that occur in enrolled fingerprints over time. The biometric system can handle up to 30 fingerprint templates. Includes AC power adapter. Also runs up to 1 year on 9V battery.