See in the following description how to handle the electronic door-lock:

(1) This is the door and the code-entry to your apartment

(2) When you start is the display dark

(3) After you (light) knocked the frame of the code-entry the display shows an empty line

(4) Each digit you enter fills one point – after the fifth digit press the bottom-left (open) key symbol

(5) When you used the correct code the code-entry welcomes you and the door unlocks – wait 5 seconds after you see ‘Gast/Guest’ and then pull the door

To lock the door when leaving redo the steps 1 – 3 but press at the end the bottom-right (closed) key symbol – the door locks with the text shown – finished