Security as standard. Feeling safe and secure is a must for any homeowner. The Keyless Lock has a tamper alarm and incorrect pin code feature. There's also no need to worry if the electricity goes down as the Keyless Lock is powered by 4 x AA batteries. It will even warn you when the batteries are low.9V battery backup.In the event of the AA batteries failing there is a further fail safe, thanks to a 9V battery connection override.What's more, when connected to a smart home system, Yales Keyless Connected allows you to unlock your door from anywhere in the world.Easy InstallationSuitable for wooden doors with a 60mm nightlatch. (Nightlatch not included). One touch controlUnlock your door with a key tag or key card with a simple tapEnhanced encryptionEnhanced security to protect against unauthorised access. Features Alarm decibels 80 dB Alarm function Yes Lock type Code, Keyless Product colour Black Product type Smart door lock Battery Number of batteries included 4 pc(s) Battery type