With the weiser homeconnect door lock, you can lock or unlock the door from anywhere right from your smartphone. The metal housing delivers quality that can be felt for added security and durability. Smart door lock features 250 user codes encryption/security rating 128-bit/bhma grade 2 certified remote access: yes, z- wave: yes batteries: 4 aa bell smart home customers who currently have an automation device such as a smart door lock, smart thermostat or smart light bulb can add this device. Professional installation for this device is available. To learn more, please contact bell.