The push button contacts are maintenance free and therefore ensure a long service life.
The door lock can be connected to the access control module (recommended) but of course also directly to the video external unit.
You can also receive calls from this outpost on your smartphone or tablet via the Niko app for access control (Android or iOS).
This external video unit only works in combination with access control module 510-21400, which also provides power to the outdoor station. With the accompanying internal video unit 510-50000 you complete the system completely (not required, only smartphone in this case)