In addition to the correct password, you can also unlock the door by entering random numbers before or after the correct password. Using a mobile app, you can remotely manage the smart lock, including unlocking it, locking it, and monitoring its status from afar (Gateway required).icons-app,With the free Next lock app, you are able to open, close, share, or revoke access with others.To learn more please visit:https://www.smonet.com/products/a1-sbf-smonet-smart-deadbolt-lock/ Telephone: +86-755-82830586 read full review »