The three models worth comparing are the eufy FamiLock E40, eufy FamiLock E35, and eufy FamiLock E32. eufy FamiLock E40: The All-in-One Front Door UpgradeThe FamiLock E40 is the most feature-rich of the three and the one that feels closest to a full front-door security hub. Instead of buying a smart lock and a separate video doorbell, the E40 wraps both into one package. eufy FamiLock E35: Palm Scan Convenience Without the CameraThe FamiLock E35 is the interesting middle ground. For most households, that is still one of the fastest and most familiar ways to use a smart lock.