You can easily upgrade your existing "Fail-Safe / Fail-Secure / Electric Lock"  to work with your smartphone for higher security and efficiency. The SB22A and the powerful EZSmart App can issue and revoke up to 40 virtual keys to new users and review the access log to know who comes. The SB22A does support Key Fob (remote control) for office manager to unlock the entrance door when visitor ring the doorbell within 20 meters working distance. 

The SB22A is not only let you to unlock your Electric lock by conventional Electric lock method; it also provides free advanced mobile App for secure App Unlock and sharing key and monitoring door activities log functions or simply using the Key Fob (optional item). The EZSmart App allows you to grant or revoke access to a third party’s smartphone by secure QR Code or email. This virtual ekey cannot be duplicated or transferred to other devices. With GPS function and correctly calibrating the EZSmart App, the App can identify indoor and outdoor areas. This will prevent accidentally unlock from "Near-Field unlock function".