Door opener to apartment door with 3 control methods, regulated with unit for environmental control system (Abilia), switch on wall, or with key (which is inserted into the ordinary lock).
A good practical solution, according to the user. He feels it is good that you can choose how to open the door. When he is outside he does not need the key; he just presses on the unit. When he is inside, he can choose to press the switch.
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This unit from Abilia is not available anymore, Abilia has other has similar products, see abilia.com/en (last checked May 2020).
This tip is from 2005