The Tessi Lock Smart Fingerprint is a convenient and secure option for situations where a master-key type system is required. It allows for the setup of an administrator and the addition of up to 20 users. The administrator can also delete all fingerprints as needed. This lock comes with a rechargeable battery that provides up to 180 days of use or 2,000 uses, depending on usage. A low battery indicator is included, and a charging cable is provided for easy recharging.