Concealed smart door lock.
<video controls autoplay loop> <source src="https://s3-us-west-1.amazonaws.com/hmt-forum/concealed_biometric_door_lock.mp4" type="video/mp4"> Your browser does not support the video tag. </video>
Previously:
https://www.homemadetools.net/forum/...072#post153459
https://www.homemadetools.net/forum/...682#post147788
https://www.homemadetools.net/forum/...490#post142913