Touchpad and fingerprint entry without a key There are four methods for unlocking: fingerprint, proximity card, passcode, or traditional key. It's now much safer and easier to return home. Your guest can press the built-in electronic doorbell on the Smart Lock to find out who is home by listening to its loud 65 dB volume. To suit your needs, choose mute, high, or low volume. You can be confident, though, that these settings won't impact the volume of the low-battery or anti-tamper alerts. Your house, family, and possessions are safe and secure because the lock will sound a loud siren to frighten away anyone trying to force their way inside. Utilizing four AA alkaline batteries for power, the L2