Well looking at the myKey 2300 you would maybe think that it was a telephone, but the clue is that it’s missing a door. The MyKey 2300 is an RFID lock that requires a RFID card and shazam your door opens on it’s own. They have even thought of adding a keypad that slides open should you have lost your card.
Loose something me ? Never ! 
There is even the possibility to press a battery up against the door knob, should the AA batteries it runs off die on you. I doubt I’ll ever have one of these but it does seem to have been nicely thought through !
Check the MyKey 2300 web site out
on 
on 
on 
I just realised looking at this, that the two round metal points are probably where you can press the battery against should you’re AA batteries in the device run out !
And what happens when you have lost your key and you’re not carrying the appropriate 9v battery? (that fits the two metal rounded bits?) around with you ? LOL
Well I suppose that means like my alarm system that a burglar can’t just cut the electricity to open the door !
John